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Sensors and actuators. B, Chemical 134건

  1. [해외논문]   Editorial Board   SCI SCIE SCOPUS


    Sensors and actuators. B, Chemical v.259 ,pp. ii - ii , 2018 , 0925-4005 ,

    초록

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  2. [해외논문]   Selective and sensitive glycoprotein detection via a biomimetic electrochemical sensor based on surface molecular imprinting and boronate-modified reduced graphene oxide   SCI SCIE SCOPUS

    Huang, Jing (Corresponding author.) , Wu, Yunan , Cong, Jiaojiao , Luo, Jing , Liu, Xiaoya
    Sensors and actuators. B, Chemical v.259 ,pp. 1 - 9 , 2018 , 0925-4005 ,

    초록

    Abstract Glycoproteins are closely associated with the occurrence of diverse diseases, and they have been used as biomarkers and therapeutic targets in clinical diagnostics. The selective and sensitive sensing of glycoproteins still remains a challenge. Herein, we describe a biomimetic electrochemical sensor based on a novel boronate-modified graphene-molecular imprinted polymers composite (BGR@MIP) as recognition element that is well suited for detecting glycoproteins selectively and sensitively. Boronic acid functionalized reduced graphene oxide (BGR) bearing a covalent ester linkage to glycoprotein via boronate affinity was synthesized and used as supporting matrix for preparing graphene surface imprinted composite by sol-gel polymerization of organic silanes. The fabrication process of the BGR@MIP sensor was monitored by differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) using [Fe(CN) 6 ] 3−/4− as probe. The combination of boronate affinity and molecularly imprinting effect endowed the sensor with remarkable selectivity for the template glycoprotein (ovalbumin, OVA). Under optimized experimental conditions, the proposed sensor exhibited a good linear response to OVA in the concentration range of 1.0 × 10 −10 mg mL −1 to 1.0 × 10 −4 mg mL −1 with detection limit of 2.0 × 10 −11 mg mL −1 , which outperformed other previously reported OVA detecting methods High stability and good reproducibility was also demonstrated. In addition, this sensor was successfully applied to the monitoring of OVA in biological fluids. Highlights Boronate-modified graphene-molecular imprinted composite (BGR@MIP) was prepared. BGR@MIP showed good selectivity toward OVA combining boronate affinity and MIP effect. The BGR@MIP sensor showed a wide linear response to OVA and low detection limit.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  3. [해외논문]   Optimizing the sensitivity of palladium based hydrogen sensors   SCI SCIE SCOPUS

    Fisser, Maximilian (Robinson Research Institute, Victoria University of Wellington, Wellington, New Zealand ) , Badcock, Rodney A. (Robinson Research Institute, Victoria University of Wellington, Wellington, New Zealand ) , Teal, Paul D. (School of Engineering and Computer Science, Victoria University of Wellington, Wellington, New Zealand ) , Hunze, Arvid (Robinson Research Institute, Victoria University of Wellington, Wellington, New Zealand)
    Sensors and actuators. B, Chemical v.259 ,pp. 10 - 19 , 2018 , 0925-4005 ,

    초록

    Abstract This paper reports on the sensitivity optimization of palladium based hydrogen sensors. The transduction mechanism is the volumetric expansion of palladium, leading to induced strain in a strain sensing element. Absorption of hydrogen in the palladium lattice causes expansion, which can be measured using strain sensors attached to the palladium. The strain transduced from the expanding palladium is dependent not only on the hydrogen partial pressure and temperature, but also the geometry of the palladium and the mechanical transfer of strain to the sensor. In this paper we demonstrate the design and validation of a sensor for defined hydrogen concentration ranges, selection of a working temperature, and selection of a palladium geometry to achieve a desired sensitivity. We show that operating temperature and concentration range are critical in order to avoid the phase change region, which can cause hysteresis, as well as degradation of the palladium itself and the adhesive interface. In order to quantify the strain transfer between palladium and the sensor, a coefficient of strain transfer k st is introduced. Two empirical methods are demonstrated to calculate k st : (a) via calibration for hydrogen sensitivity, (b) via calibration for temperature sensitivity. Three sensor designs, with fiber Bragg gratings as a strain sensor, are used to correlate the theoretical design assumptions with experimental data. Highlights A method to select the working temperature of a Pd based H 2 sensor to avoid the phase change region is presented. We developed a new diagram which enables the reader to easily pick a working temperature for the sensor. A method to select a palladium geometry to achieve a required sensitivity is presented. We developed new diagrams to help the reader understand the influence of the geometry of the palladium on the sensitivity and select the geometry according to the required sensitivity. Two different methods to calibrate the hydrogen sensitivity of the sensor are presented. Both rely on the strain transfer coefficient quantifying the strain that is transduced from the expanding palladium into the fiber. The strain transfer coefficient is determined via (a) a hydrogen measurement, and (b) a temperature measurement. We found that the strain transfer coefficient is the same for both mehtods. This implies that a temperature calibration can be used to also calibrate for hydrogen sensitivity.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  4. [해외논문]   A new silver (I) ions optical sensor based on nanoporous thin films of sol–gel by rose bengal dye   SCI SCIE SCOPUS

    Shahamirifard, Seyed Alireza (Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran ) , Ghaedi, Mehrorang (Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran ) , Hajati, Shaaker (Department of Semiconductors, Materials and Energy Research Center (MERC), P.O. Box 31787-316, Tehran, Iran)
    Sensors and actuators. B, Chemical v.259 ,pp. 20 - 29 , 2018 , 0925-4005 ,

    초록

    Abstract In this work, a new optical sensor was fabricated based on the incorporation of rose bengal (RB) dye as ionophore into the nanopores of thin film prepared through the sol-gel technique which was suitable for the determination of silver (I) ions in aqueous solutions. The prepared thin films were composed of Tetraethoxysilane (TEOS), RB dye, methanol (MeOH), hydrochloric acid and Triton X-100. They were characterized by field emission scanning electron microscopy (FE-SEM) and atomic force microscope (AFM). The results confirmed the uniformity and low roughness of the prepared thin films. Average roughness of thin films was obtained to be about 2.5 nm. After sensing Ag ions, X-ray photoelectron spectroscopy (XPS) was performed to understand the mechanism of interaction of Ag ions with thin film. Leaching of this sensor was investigated and it was found that the proposed sensor is stable over the time without observing any change in its sensitivity. The proposed sensor revealed a maximum peak at 519 nm in its UV-vis spectra corresponding to silver (I) – RB complex with response time of 7 min at pH 7. HNO 3 was found to be the best regenerator reagent for this optical sensor. The constructed sensor displayed a working range for Ag (I) of 3.24 × 10 −6 –8.23 × 10 −7 mol L −1 with a detection limit of 9.8 × 10 −8 mol L −1 . The optode was tested in real water samples for the determination of Ag + ions with good selectivity. Highlights Silver (I) optical sensor based on incorporation of rose bengal in thin film silica substrate was fabricated. Surface morphology of the thin films was characterized by field emission scanning electron microscopy (FE-SEM) and atomic force microscope (AFM). Interaction between Ag + ion and the rose bengal was investigated by XPS analysis. Dye leaching, response time, repeatability and reproducibility are evaluated. The sensor can be measured silver (I) at in the range of 3.24 × 10 −6 –8.23 × 10 −7 mol L −1 with a suitable limit of detection. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  5. [해외논문]   Selective NO2 detection using YSZ-based amperometric sensor attached with NiFe2O4(+ Fe2O3) sensing electrode   SCI SCIE SCOPUS

    Anggraini, Sri Ayu (Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan ) , Yoshida, Soichiro (Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan ) , Ikeda, Hiroshi (Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan ) , Miura, Norio (Art, Science and Technology Center for Cooperative Research, Kyushu University, Kasuga-shi, Fukuoka 816-8580, Japan)
    Sensors and actuators. B, Chemical v.259 ,pp. 30 - 35 , 2018 , 0925-4005 ,

    초록

    Abstract A YSZ-based amperometric sensor using spinel oxide as a sensing electrode (SE) has been proposed here for detecting NO 2 sensitively and selectively. Among the examined spinel-oxide SEs, NiFe 2 O 4 -SE was found to give relatively sensitive and selective response to NO 2 . Addition of 30 wt.% Fe 2 O 3 into NiFe 2 O 4 -SE increased the NO 2 response, while the responses to other interfering gases were maintained small. The sensor using NiFe 2 O 4 (+30 wt.% Fe 2 O 3 )-SE could detect NO 2 as low as 5 ppm in humid air within 15 s (90% response time). The mechanism of NO 2 selective behavior given by the sensor using NiFe 2 O 4 (+30 wt.% Fe 2 O 3 )–SE was investigated. Highlights The YSZ-based amperometric sensor using NiFe 2 O 4 (+Fe 2 O 3 ) electrode. This sensor detects NO 2 selectively in the range of 5–400 ppm under humid condition. The NO 2 response is unaffected by O 2 concentration in the range of 1–21 vol.%.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   Performance optimization of single-layer and double-layer high-k gate nanoscale ion-sensitive field-effect transistors   SCI SCIE SCOPUS

    Abdolkader, Tarek M. (Electrical Engineering Department, Faculty of Engineering, Umm Al-Qura University, Makkah, Saudi Arabia ) , Alahdal, Abdurrahman G. (Electrical Engineering Department, Faculty of Engineering, Umm Al-Qura University, Makkah, Saudi Arabia)
    Sensors and actuators. B, Chemical v.259 ,pp. 36 - 43 , 2018 , 0925-4005 ,

    초록

    Abstract The use of high-k dielectric materials for the gate insulator of nanoscale Ion-Sensitive Field-Effect Transistor (ISFET) has been demonstrated to generally improve the ISFET performance. High-k gate insulator reduces the gate leakage current and increases the gate capacitance, which lead to higher trans -conductance and higher current sensitivity. The best high-k material for ISFET sensors is not simply the material of highest dielectric constant because high-k ISFET performance depends on many conflicting factors such as dissociation properties with electrolytes and linearity of voltage/current variation with pH change. In this work, a comparative simulation study is presented for six high-k gate insulators (Si 3 N 4 , Al 2 O 3 , ZrO 2 , Ta 2 O 5 , HfO 2 , and TiO 2 ), along with SiO 2 for comparison, for nanoscale ISFET sensors, comparing their sensitivity and linearity. The simulation tool used (NIST) is based on the numerical solution of nanoscale ballistic MOSFET equations along with Gouy-Chapman-Stern model equations. The study presents a guideline for the determination of the optimum insulator material and insulator thickness used for nanoscale ISFETs. The study included single-layer as well as double–layer insulators in which two layers of different dielectric materials are used. Highlights Numerical simulation study of ISFET pH-sensor with high-k gate insulator. Evaluation and comparison of six high-k gate materials for optimized ISFET performance. Performance is evaluated based on sensitivity and linearity. Single-layer and double-layer gate insulators are included in the comparison.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   An NIR-emitting ESIPT dye with large stokes shift for plasma membrane of prokaryotic (E. coli) cells   SCI SCIE SCOPUS

    Dahal, Dipendra (Department of Chemistry, University of Akron, Akron, OH 44325, USA ) , Ojha, Krishna Raj (Department of Chemistry, University of Akron, Akron, OH 44325, USA ) , Alexander, Nicolas (Department of Chemistry, University of Akron, Akron, OH 44325, USA ) , Konopka, Michael (Department of Chemistry, University of Akron, Akron, OH 44325, USA ) , Pang, Yi (Department of Chemistry, University of Akron, Akron, OH 44325, USA)
    Sensors and actuators. B, Chemical v.259 ,pp. 44 - 49 , 2018 , 0925-4005 ,

    초록

    Abstract A near infrared-emitting cyanine with a very large Stokes shift (Δλ ≈ 230 nm) was synthesized by coupling with excited state intramolecular proton transfer (ESIPT). Fluorescence response of the probe was examined at different pH and at different temperatures, which revealed the important role of ESIPT in the fluorescence. In comparison with commercial FM1-43 (ϕ fl ≈ 0.03 in CH 2 Cl 2 ), which is a popular styryl dye for membrane staining, the developed new probe 2a exhibited a significantly higher quantum yield (ϕ fl ≈ 0.34 in CH 2 Cl 2 ), attributing to the effective intramolecular hydrogen bonding which is present in the latter. In addition, the probe exhibited very good selectivity for imaging plasma membrane of prokaryotic cells, indicating its potential for imaging membrane of procaryotic ( E. coli ) cells. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [해외논문]   Novel two-step activation of biomass-derived carbon for highly sensitive electrochemical determination of acetaminophen   SCI SCIE SCOPUS

    Kim, Dongwon (Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742, Republic of Korea ) , Kim, Jong Min (Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742, Republic of Korea ) , Jeon, Youngmoo (Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742, Republic of Korea ) , Lee, Jeongyeon (Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742, Republic of Korea ) , Oh, Jiseop (Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742, Republic of Korea ) , Hooch Antink, Wytse (Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742, Republic of Korea ) , Kim, Daekyu (Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742, Republic of Korea ) , Piao, Yuanzhe (Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742, Republic of Korea)
    Sensors and actuators. B, Chemical v.259 ,pp. 50 - 58 , 2018 , 0925-4005 ,

    초록

    The determination of the concentration of acetaminophen (AC) in the human body is of significant importance to carefully monitor and regular drug safety and public health. However, most conventional methods are insufficient due to their time-consuming, expensive and complicated nature. In this study, we report a novel two-step activation of biomass-derived carbon for the electrochemical determination of AC. The electrode material is prepared by a two-step activation process, which involves the initial activation of kelp powder with ZnCl2, followed by an activation step with KOH. The activation procedure greatly increased the overall pore volume and specific surface area. The characterizations of ZnCl2-KOH activated kelp carbon (ZKAKC) were conducted with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis, and electrochemical impedance spectroscopy (EIS). The electrochemical characterization of ZKAKC was performed with cyclic voltammetry (CV) analysis of potassium ferricyanide. The sensing ability of ZKAKC/GCE toward acetaminophen was conducted using CV analysis and differential pulse voltammetry (DPV). The modified electrode showed high sensitivity, selectivity and a good detection limit for the determination acetaminophen with the detection limit of 0.004 mu M. Also, the modified electrode showed good result toward acetaminophen even in the presence of ascorbic acid and dopamine with the detection limit of 0.007 mu M. For the evaluation of sensing ability as an actual electrochemical sensor, a real sample test was conducted. The electrochemical performance was enhanced due to the increased physical and electrochemical surface area, which occurred during the two-step activation process. This approach for producing activated carbon is crucial for future development and can be applied to different carbon source materials. (c) 2017 Elsevier B.V. All rights reserved.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   Molybdenum oxide nanosheets meet ascorbic acid: Tunable surface plasmon resonance and visual colorimetric detection at room temperature   SCI SCIE SCOPUS

    Li, Rui (School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, PR China ) , An, Hongjie (Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore ) , Huang, Wei (School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, PR China ) , He, Yi (School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang, 621010, PR China)
    Sensors and actuators. B, Chemical v.259 ,pp. 59 - 63 , 2018 , 0925-4005 ,

    초록

    Abstract Here we report a simple, rapid, and environmentally friendly method for the preparation of non-stoichiometric MoO 3 (MoO 3-x ) nanosheets using ascorbic acid (AA) as a reducing agent under an acidic environment at room temperature. The resultant MoO 3-x nanosheets show an intense blue color and strong localized surface plasmon resonance (LSPR) in the visible and near-infrared region, which can be tuned by changing the pH values of the preparation solution. The hydrogen ions intercalate into the lattice of MoO 3 and bond to oxygen atoms to generate water molecules, and the electron of the AA is transferred to Mo cations, which results in the reduction of Mo 6+ and formation of oxygen vacancies, giving rise to the LSPR. Additionally, a visual colorimetric assay has been developed for the detection of AA in aqueous solutions and serum samples. The absorbance at 820 nm is linearly related to the logarithm of the AA concentration in the range of 1 mM–100 mM with a limit of detection of 0.09 mM at a signal-to-noise ratio of 3. Highlights A environmentally friendly strategy is developed for preparation of plasmonic MoO 3-x nanosheets. A visual colometric assay for ascorbic acid (AA) based on the plasmonic MoO 3-x nanosheets is established. This assay is successfully applied for the detection of AA in real serum samples.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  10. [해외논문]   Transparent polymer-based SERS substrates templated by a soda can   SCI SCIE SCOPUS

    Creedon, Niamh C. (Nanotechnology Group, Tyndall National Institute–University College Cork, Lee Maltings, Mardyke Parade, Cork, Ireland ) , Lovera, Pierre (Nanotechnology Group, Tyndall National Institute–University College Cork, Lee Maltings, Mardyke Parade, Cork, Ireland ) , Furey, Ambrose (Mass Spectrometry Centre for Proteomics and Biotoxin Research, Department of Chemistry, Cork Institute of Technology, Cork, Ireland ) , O'Riordan, Alan (Nanotechnology Group, Tyndall National Institute–University College Cork, Lee Maltings, Mardyke Parade, Cork, Ireland)
    Sensors and actuators. B, Chemical v.259 ,pp. 64 - 74 , 2018 , 0925-4005 ,

    초록

    Abstract This paper demonstrates the reproducible fabrication of transparent Surface Enhanced Raman Scattering (SERS) substrates, fabricated by employing an aluminium soda can to template nanostructures on a flexible thermoplastic polymer surface, followed by deposition of a silver over layer. Electron microscopy and finite element modelling simulations strongly suggested the SERS response arose at regions of high electromagnetic field strength occurring between metallic clusters following illumination by monochromatic radiation. The sensors exhibited rapid, quantitative and high sensitivity, for example, 5 × 10 −10 M (204 pg/mL) crystal violet detection in 10 min using a simple drop and dry method. We also show detection of glucose employing a chemically modified silver surface bearing a pre-deposited SAM layer. Furthermore, the transparent substrates permitted back excitation and collection through the substrate with corresponding spectra exhibiting clear and well-defined spectral SERS peaks. Finally, we present the detection of trace amounts of melamine in complex media solution (milk and infant formula). We benchmark the sensor performance using commercial analytical instrumentation (MS-MS) and show comparable sensitivity between the SERS substrates and MS-MS. Highlights Silver coated transparent flexible polymer substrates (templated with Aluminium soda cans) for use in surface Enhanced Raman scattering (SERS) applications. The sensors exhibit rapid, quantitative and highly sensitive spectra in 10 min using a simple drop and dry method. SERS response is also observed via back excitation (the laser impinging on the back of the substrate) with the corresponding spectra exhibiting clear and defined spectral Raman peaks. The sensors exhibit sensitive, non-destructive detection of trace amounts of melamine in both milk and infant formula. We show comparable sensitivity between the low-cost SERS substrates and lab based MS-MS. Graphical abstract [DISPLAY OMISSION]

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