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Applied surface science 145건

  1. [해외논문]   Editorial Board   SCI SCIE


    Applied surface science v.433 ,pp. ii - ii , 2018 , 0169-4332 ,

    초록

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  2. [해외논문]   Atomic configurations in AP-MOVPE grown lattice-mismatched InGaAsN films unravelled by X-ray photoelectron spectroscopy combined with bulk and surface characterization techniques   SCI SCIE

    Ló (Depto de Ingeniería Química, Andalucía Tech, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga Spain ) , pez-Escalante, M.C. (Faculty of Microsystem Electronics and Photonics, Wrocław University of Science and Technology,Janiszewskiego Street 11/17, 50-372 Wrocław, Poland ) , Ś (Faculty of Microsystem Electronics and Photonics, Wrocław University of Science and Technology,Janiszewskiego Street 11/17, 50-372 Wrocław, Poland ) , ciana, B. (Faculty of Microsystem Electronics and Photonics, Wrocław University of Science and Technology,Janiszewskiego Street 11/17, 50-372 Wrocław, Poland ) , Dawidowski, W. (The Nanotech Unit, Depto. de Física Aplicada I, Andalucía Tech, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga Spain) , Bielak, K. , Gabá , s, M.
    Applied surface science v.433 ,pp. 1 - 9 , 2018 , 0169-4332 ,

    초록

    Abstract This work presents the results of X-ray photoelectron spectroscopy studies on the bonding N configuration in InGaAsN epilayers grown by atmospheric pressure metal organic vapour phase epitaxy. Growth temperature has been tuned in order to obtain both, relaxed and strained layers. The studies were concentrated on analysing the influence of the growth temperature, post growth thermal annealing process and surface quality on the formation of Ga-N and In-N bonds as well as N-related defects. The contamination of InGaAsN films by growth precursor residues and oxides has also been addressed. The growth temperature stands out as a decisive factor boosting In-N bonds formation, while the thermal annealing seems to affect the N-related defects density in the layers.

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  3. [해외논문]   MnS decorated N/S codoped 3D graphene which used as cathode of the lithium-sulfur battery   SCI SCIE

    Li, Zhongtao (State Key Laboratory of Heavy Oil Processing, School of Chemical Engineering, China University of Petroleum, Qingdao 266580, China ) , Xu, Rongfei (State Key Laboratory of Heavy Oil Processing, School of Chemical Engineering, China University of Petroleum, Qingdao 266580, China ) , Deng, Shenzhen (State Key Laboratory of Heavy Oil Processing, School of Chemical Engineering, China University of Petroleum, Qingdao 266580, China ) , Su, Xin (State Key Laboratory of Heavy Oil Processing, School of Chemical Engineering, China University of Petroleum, Qingdao 266580, China ) , Wu, Wenting (State Key Laboratory of Heavy Oil Processing, School of Chemical Engineering, China University of Petroleum, Qingdao 266580, China ) , Liu, Shuiping (State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University, Shanghai 201620, China ) , Wu, Mingbo (State Key Laboratory of Heavy Oil Processing, School of Chemical Engineering, China University of Petroleum, Qingdao 266580, China)
    Applied surface science v.433 ,pp. 10 - 15 , 2018 , 0169-4332 ,

    초록

    Abstract A scale-upable MnS nanocrystal decorated N/S codoped graphene nanocomposite (MNSG) for Li-S batteries has been readily synthesized through hydrothermal process and followed by thermal treatment under N 2 . Sulfur is loaded into nanohybrid to produce an outstanding Li-S battery cathode through integrating the advantages and avoiding the disadvantages of graphene and MnS. The optimized cathode can deliver a higher capacity of 756mAhg −1 at 0.5C (1C=1675mAg −1 ) after 200 cycles and can retain 73% of the initial capacity, which indicates a potential applicable cathode material for lithium-sulfur batteries. Highlights The conductive nanohybrids are composed of N/S codoped graphene and MnS. Graphene improves the conductivity and MnS suppresses the shuttle effect. Great electrochemical properties as cathode of Li-S battery. Graphical abstract [DISPLAY OMISSION]

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  4. [해외논문]   High-performance cobalt carbonate hydroxide nano-dot/NiCo(CO3)(OH)2 electrode for asymmetric supercapacitors   SCI SCIE

    Lee, Damin (School of Materials Science and Engineering, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Republic of Korea ) , Xia, Qi Xun (School of Materials Science and Engineering, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Republic of Korea ) , Yun, Je Moon (Global Frontier R&D Center for Hybrid Interface Materials, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Republic of Korea ) , Kim, Kwang Ho (School of Materials Science and Engineering, Pusan National University, San 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, Republic of Korea)
    Applied surface science v.433 ,pp. 16 - 26 , 2018 , 0169-4332 ,

    초록

    Abstract Binder-free mesoporous NiCo(CO 3 )(OH) 2 nanowire arrays were grown using a facile hydrothermal technique. The Co 2 (CO 3 )(OH) 2 in NiCo(CO 3 )(OH) 2 nanowire arrays was well-decorated as nano-dot scale (a few nanometer). In addition, increasing cobalt content in nickel compound matrix, NiCo(CO 3 )(OH) 2 nanowire arrays were separately uniformly grown without agglomeration on Ni foam, providing a high specific surface area to help electrolyte access and ion transfer. The enticing composition and morphology of the NiCo(CO 3 )(OH) 2 nanowire exhibit a superior specific capacity of 1288.2mAhg −1 at a current density of 3Ag −1 and excellent cycling stability with the capacity retention of 80.7% after 10,000 cycles. Furthermore, an asymmetric supercapacitor composed of the NiCo(CO 3 )(OH) 2 composite as a positive electrode and the graphene as a negative electrode presented a high energy density of 35.5Whkg −1 at a power density of 2555.6Wkg −1 and satisfactory cycling stability with 71.3% capacity retention after 10,000 cycles. The great combination of the active nano-dot Co 2 (CO 3 )(OH) 2 and the individually grown NiCo(CO 3 )(OH) 2 nanowires made it a promising electrode material for asymmetric supercapacitors. A well-developed nanoarchitecture of the nano-dot Co 2 (CO 3 )(OH) 2 decorated NiCo(CO 3 )(OH) 2 composite could pave the way for an excellent electrode design for high-performance supercapacitors. Highlights By adding cobalt compound, NiCo(CO) 3 (OH) 2 nanowires are separately grown without agglomeration. The nano-scale Co 2 (CO 3 )(OH) 2 is distributed in NiCo(CO 3 )(OH) 2 nanowire arrays. The NiCo(CO) 3 (OH) 2 electrode shows a great specific capacity of 1288.2mAhg −1 at a current density of 3Ag −1 .

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  5. [해외논문]   Influence of Nb-doped TiO2 blocking layers as a cascading band structure for enhanced photovoltaic properties   SCI SCIE

    Koo, Bon-Ryul (Program of Materials Science & Engineering, Convergence Institute of Biomedical Engineering and Biomaterials, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea ) , Oh, Dong-Hyeun (Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea ) , Ahn, Hyo-Jin (Program of Materials Science & Engineering, Convergence Institute of Biomedical Engineering and Biomaterials, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea)
    Applied surface science v.433 ,pp. 27 - 34 , 2018 , 0169-4332 ,

    초록

    Abstract Nb-doped TiO 2 (Nb-TiO 2 ) blocking layers (BLs) were developed using horizontal ultrasonic spray pyrolysis deposition (HUSPD). In order to improve the photovoltaic properties of the dye-sensitized solar cells (DSSCs), we optimized the Nb doping level of the Nb-TiO 2 BLs by controlling the Nb/Ti molar ratio (0, 5, 6, and 7) of the precursor solution for HUSPD. Compared to bare TiO 2 BLs, the Nb-TiO 2 BLs formed a cascading band structure using the positive shift of the conduction band minimum of the Nb-TiO 2 positioned between fluorine-doped tin oxide (FTO) and TiO 2 . This results in the increase of the potential current and the suppression of the electron recombination. Hence, it led to the improvement of the electrical conductivity, due to the increased electron concentration by the Nb doping into TiO 2 . Therefore, the DSSC fabricated with the Nb-TiO 2 BLs at a Nb/Ti molar ratio of 6 showed superior photoconversion efficiency (∼7.50±0.20%) as a result of the improved short-circuit current density. This is higher than those with the other Nb-TiO 2 BLs and without BL. This improvement of the photovoltaic properties for the DSSCs can be attributed to the synergistic effects of uniform and compact BL relative to the prevention of the backward electron transport at the FTO/electrolyte interface, efficient electron transport at interfaces relative to a cascading band structure of FTO/Nb-TiO 2 /TiO 2 multilayers and the facilitated electron transport at the BLs relative to the increased electrical conductivity of the optimized Nb-TiO 2 BLs. Highlights Nb-doped TiO 2 (Nb-TiO 2 ) layers prepared by using horizontal ultrasonic spray pyrolysis deposition. Nb-TiO 2 layers formed a cascading band structure to efficiently suppress the electron recombination. Nb-TiO 2 layers resulted in the increase of the electrical conductivity by the Nb doping into TiO 2 . A novel blocking layer for improving the photovoltaic performances of dye-sensitized solar cells.

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  6. [해외논문]   Lithium-ions diffusion kinetic in LiFePO4/carbon nanoparticles synthesized by microwave plasma chemical vapor deposition for lithium-ion batteries   SCI SCIE

    Gao, Chao (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China ) , Zhou, Jian (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China ) , Liu, Guizhen (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China ) , Wang, Lin (Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan, 430070, PR China)
    Applied surface science v.433 ,pp. 35 - 44 , 2018 , 0169-4332 ,

    초록

    Abstract Olivine structure LiFePO 4 /carbon nanoparticles are synthesized successfully using a microwave plasma chemical vapor deposition (MPCVD) method. Microwave is an effective method to synthesize nanomaterials, the LiFePO 4 /carbon nanoparticles with high crystallinity can shorten diffusion routes for ionic transfer and electron tunneling. Meanwhile, a high quality, complete and homogenous carbon layer with appropriate thickness coating on the surface of LiFePO 4 particles during in situ chemical vapor deposition process, which can ensure that electrons are able to transfer fast enough from all sides. Electrochemical impedance spectroscopy (EIS) is carried out to collect information about the kinetic behavior of lithium diffusion in LiFePO 4 /carbon nanoparticles during the charging and discharging processes. The chemical diffusion coefficients of lithium ions, D Li , are calculated in the range of 10 −15 –10 −9 cm 2 s −1 . Nanoscale LiFePO 4 /carbon particles show the longer regions of the faster solid-solution diffusion, and corresponding to the narrower region of the slower two-phase diffusion during the insertion/exaction of lithium ions. The CV and galvanostatic charge-discharge measurements show that the LiFePO 4 /carbon nanoparticles perform an excellent electrochemical performance, especially the high rate capacity and cycle life. Highlights Nanoscale LiFePO 4 /carbon is first synthesized successfully using MPCVD method. Kinetic behavior of electrode during charge/discharge process is explored by EIS. Li-ion diffusion is slower in two-phase stage compared with that in single-phase. Nanosize can widen fast single-phase diffusion, shorten slow two-phase diffusion. A complete, uniform, thin carbon coating layer can ensure electron transport fast.

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  7. [해외논문]   Preparation, characterization, and nonlinear optical properties of hybridized graphene @ gold nanorods nanocomposites   SCI SCIE

    Guo, Jia (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China ) , Ning, Tingyin (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China ) , Han, Yanshun (Qilu Institute of Technology, Jinan 250200, China ) , Sheng, Yingqiang (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China ) , Li, Chonghui (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China ) , Zhao, Xiaofei (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China ) , Lu, Zhengyi (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China ) , Man, Baoyuan (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China ) , Jiao, Yang (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China ) , Jiang, Shouzhen (School of Physics and Electronics, Shandong Normal University, Jinan 250014, China)
    Applied surface science v.433 ,pp. 45 - 50 , 2018 , 0169-4332 ,

    초록

    Abstract The methods of chemical vapor deposition (CVD) and seed-mediated growth were used to obtain graphene and gold nanorods (GNRs), respectively. We fabricate graphene @ gold nanorods (G@GNRs) nanocomposites by successively using dropping and transferring methods Through SEM, Raman spectra and TEM analysis, the number of graphene layers is 6–7. The diameter of gold nanorods (GNRs) is about 10nm and the average aspect ratio is 6.5. In addition, we systematically investigate their nonlinear optical responses by using open-aperture Z -scan technique. In contrast with graphene and GNRs, the G@GNRs nanocomposites exhibit excellent nonlinear optical response with a modulation depth of about 51% and a saturable intensity of about 6.23 GW/cm 2 . The results suggest that the G@GNRs nanocomposites could potentially be used as an optical modulator in pulsed laser generation. Highlights We used a simple and inexpensive method to obtain the composite of graphene @ gold nanorods (G@GNRs). We used a simple method to measure the nonlinear optical properties of the G@GNRs. Compared with single graphene and GNRs, the G@GNRs nanocomposites exhibits many advantages.

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  8. [해외논문]   Evolution of resistive switching mechanism through H2O2 sensing by using TaOx-based material in W/Al2O3/TaOx/TiN structure   SCI SCIE

    Chakrabarti, Somsubhra (Thin Film Nano Tech. Lab., Department of Electronics Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 33302, Taiwan ) , Panja, Rajeswar (Thin Film Nano Tech. Lab., Department of Electronics Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 33302, Taiwan ) , Roy, Sourav (Thin Film Nano Tech. Lab., Department of Electronics Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 33302, Taiwan ) , Roy, Anisha (Thin Film Nano Tech. Lab., Department of Electronics Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 33302, Taiwan ) , Samanta, Subhranu (Thin Film Nano Tech. Lab., Department of Electronics Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 33302, Taiwan ) , Dutta, Mrinmoy (Thin Film Nano Tech. Lab., Department of Electronics Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan, 33302, Taiwan ) , Ginnaram, Sreekanth (Thin Film Nano Tech. Lab., Department of Electronics Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Sha) , Maikap, Siddheswar , Cheng, Hsin-Ming , Tsai, Ling-Na , Chang, Ya-Ling , Mahapatra, Rajat , Jana, Debanjan , Qiu, Jian-Tai , Yang, Jer-Ren
    Applied surface science v.433 ,pp. 51 - 59 , 2018 , 0169-4332 ,

    초록

    Abstract Understanding of resistive switching mechanism through H 2 O 2 sensing and improvement of switching characteristics by using TaO x -based material in W/Al 2 O 3 /TaO x /TiN structure have been reported for the first time. Existence of amorphous Al 2 O 3 /TaO x layer in the RRAM devices has been confirmed by transmission electron microscopy. By analyzing the oxidation states of Ta 2+ /Ta 5+ for TaO x switching material and W 0 /W 6+ for WO x layer at the W/TaO x interface through X-ray photoelectron spectroscopy and H 2 O 2 sensing, the reduction-oxidation mechanism under Set/Reset occurs only in the TaO x layer for the W/Al 2 O 3 /TaO x /TiN structures. This leads to higher Schottky barrier height at the W/Al 2 O 3 interface (0.54eV vs. 0.46eV), higher resistance ratio, and long program/erase endurance of >10 8 cycles with 100ns pulse width at a low operation current of 30μA. Stable retention of more than 10 4 s at 85°C is also obtained. Using conduction mechanism and reduction-oxidation reaction, current-voltage characteristic has been simulated. Both TaO x and WO x membranes have high pH sensitivity values of 47.65mV/pH and 49.25mV/pH, respectively. Those membranes can also sense H 2 O 2 with a low concentration of 1nM in an electrolyte-insulator-semiconductor structure because of catalytic activity, while the Al 2 O 3 membrane does not show sensing. The TaO x material in W/Al 2 O 3 /TaO x /TiN structure does not show only a path towards high dense, small size memory application with understanding of switching mechanism but also can be used for H 2 O 2 sensors. Highlights Simulated resistive switching mechanism is due to the change in oxidation states between Ta 2+ and Ta 5+ . The oxidation states are evidenced by X-ray photo-electron spectroscopy and H 2 O 2 sensing. Al 2 O 3 layer restricts the formation of WO x layer, hence longer 10 8 program/erase cycles are achieved with 100ns pulse width at current of 30μA. TaO x as a sensing membrane shows detection of H 2 O 2 with a low concentration of 1nM. Graphical abstract [DISPLAY OMISSION]

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  9. [해외논문]   Design of high-activity single-atom catalysts via n-p codoping   SCI SCIE

    Wang, Xiaonan (Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, Shanxi Normal University, Linfen, 041004, China ) , Zhou, Haiyan (Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, Shanxi Normal University, Linfen, 041004, China ) , Zhang, Xiaoyang (Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, Shanxi Normal University, Linfen, 041004, China ) , Jia, Jianfeng (Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, Shanxi Normal University, Linfen, 041004, China ) , Wu, Haishun (Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, Shanxi Normal University, Linfen, 041004, China)
    Applied surface science v.433 ,pp. 60 - 65 , 2018 , 0169-4332 ,

    초록

    Abstract The large-scale synthesis of stable single-atom catalysts (SACs) in experiments remains a significant challenge due to high surface free energy of metal atom. Here, we propose a concise n-p codoping approach, and find it can not only disperse the relatively inexpensive metal, copper (Cu), onto boron (B)-doped graphene, but also result in high-activity SACs. We use CO oxidation on B/Cu codoped graphene as a prototype example, and demonstrate that: (1) a stable SAC can be formed by stronger electrostatic attraction between the metal atom ( n -type Cu) and support ( p -type B-doped graphene). (2) the energy barrier of the prototype CO oxidation on B/Cu codoped graphene is 0.536eV by the Eley-Rideal mechanism. Further analysis shows that the spin selection rule can provide well theoretical insight into high activity of our suggested SAC. The concept of n-p codoping may lead to new strategy in large-scale synthesis of stable single-atom catalysts. Highlights Electrostatic attraction from n - p codopants can fabricate a stable single-atom catalyst. CO oxidation reaction on B/Cu codoped graphene has a low energy barrier. Spin selection rule plays a key important role in the high activity. Graphical abstract [DISPLAY OMISSION]

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  10. [해외논문]   Thermally oxidized Inconel 600 and 690 nickel-based alloys characterizations by combination of global photoelectrochemistry and local near-field microscopy techniques (STM, STS, AFM, SKPFM)   SCI SCIE

    Mechehoud, F. (Université) , Benaioun, N.E. (d'Oran I Ahmed Benbella, Laboratoire de Physique des Couches Minces et Matériaux pour l'Electronique (LPC2ME), BP 1524, El M'Naouer, 31000 Oran, Algeria ) , Hakiki, N.E. (Université) , Khelil, A. (d'Oran I Ahmed Benbella, Laboratoire de Physique des Couches Minces et Matériaux pour l'Electronique (LPC2ME), BP 1524, El M'Naouer, 31000 Oran, Algeria ) , Simon, L. (Université) , Bubendorff, J.L. (d'Oran I Ahmed Benbella, Laboratoire de Physique des Couches Minces et Matériaux pour l'Electronique (LPC2ME), BP 1524, El M'Naouer, 31000 Oran, Algeria )
    Applied surface science v.433 ,pp. 66 - 75 , 2018 , 0169-4332 ,

    초록

    Abstract Thermally oxidized nickel-based alloys are studied by scanning tunnelling microscopy (STM), scanning tunnelling spectroscopy (STS), atomic force microscopy (AFM), scanning kelvin probe force microscopy (SKPFM) and photoelectro-chemical techniques as a function of oxidation time at a fixed temperature of 623K. By photoelectrochemistry measurements we identify the formation of three oxides NiO, Fe 2 O 3 , Cr 2 O 3 and determine the corresponding gap values. We use these values as parameter for imaging the surface at high bias voltage by STM allowing the spatial localization and identification of both NiO, Fe 2 O 3 oxide phases using STS measurements. Associated to Kelvin probe measurements we show also that STS allow to distinguished NiO from Cr 2 O 3 and confirm that the Cr 2 O 3 is not visible at the surface and localized at the oxide/steel interface. Highlights Gap values of NiO, Fe 2 O 3 , Cr 2 O 3 oxide layers are determined by photoelectrochemistry. STS allows to distinguished NiO from Cr 2 O 3 . Localization at the nanometric scale of the several oxides (NiO and Fe 2 O 3 ) by STM. A local approach by near-field techniques is complementary to photocurrent techniques.

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