MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
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IF 3.927
Xueling Yuan,Lixia Sun,Junqi Wang,Dankui Liao,Jianhua Sun
Pyrolyze metal-organic frameworks (MOFs) is a promising method to prepare metal oxides with large specific surface and multiple active sites. The obtained metal oxides can be utilized as gas sensors. Noble metal doping is an effective way to improve the gas sensitivity of materials. In this work, SnO 2 are prepared by pyrolyzation of metal organic frameworks and Ag-doped SnO 2 composites are fabricated by AgNO 3 reduction in a water bath at 4 °C. The gas-sensing experiment reveals that the optimum operating temperature of different mass fraction of Ag doped SnO 2 samples is 250 °C which is lower than pure SnO 2 (300 °C). The response of composites (7 wt% Ag–SnO 2 ) is 157 to 10 ppm ethanol, which is about 10 times higher than pure SnO 2 (14). The composites have good selectivity and stability. Such excellent performance is contributed to the increase of the gas adsorption capacity , catalytic active site and oxygen vacancy of the composites caused by the doping of Ag.
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高影响因子
JOURNAL OF CATALYSIS
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2021
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IF 7.92
Guilin Dong,Zuwei Luo,Yueqiang Cao,Sainan Zheng,Jinghong Zhou,Wei Li,Xinggui Zhou
Ag catalysts are promising for the selective hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG), where the size of Ag nanoparticles strongly dominates their catalytic performances. Fundamental understandings on the size dependence, especially at the level of active sites, are still lacking but of great importance for the rational design of Ag-based catalysts for this reaction. Herein, a series of catalysts consisting of Ag nanoparticles sized from 2.9 to 8.8 nm anchored on amine-derivatized mesoporous silica nanospheres (Ag/AS) were synthesized and employed to understand the size-dependent DMO hydrogenation to MG. A volcano-shape trend between the hydrogenation activity and the increasing Ag particle size is observed for the differently sized Ag/AS catalysts, indicating a remarkable size dependence. The origin of the size dependence is further understood based on the cuboctahedron model of Ag nanoparticle, and the step-likes active sites are identified as the dominant ones. Results combining with the X-ray photoelectron spectroscopy, in situ Fourier transform infrared spectroscopy and temperature programmed desorption studies, indicate that the hydrogenation of DMO to MG on Ag/AS catalysts is mainly dominated by the number of active sites when the Ag particle size ≥ 5.3 nm, but by the electronic properties when the Ag particle size < 5.3 nm. The balance between the number of active sites and electronic structure gives rise to a maximal reaction rate in term of apparent TOF on the Ag/AS catalyst with Ag particle size of 5.3 nm. These understandings may guide the design of highly efficient Ag catalysts for the coal-based MG production.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Shuang Dong,Zhou Yang,Baoliang Liu,Jintao Zhang,Peng Xu,Meng Xiang,Tong Lu
The research and develpoment of biomass waste derived carbon materials have attracted tremendous research interests in fabrication of high performance electrochemical sensors. In this work, noble metal NPs (i.e., Pd, Au and Ag) loading on Loofah sponge-derived well-ordered macroporous carbon (OMC)/ N -doped carbon thin layer (N-C) was designed by a general approach. This polydopamine (PDA)-based method has the advantages of simplicity, high efficiency and versatility. In virtue of the synergistic contribution from 3D macroporous carbon scaffold and highly active nobel metal NPs, these as-prepared Pd@OMC/N-C, Au@OMC/N-C and Ag@OMC/N-C electrode exhibit excellent electrochemical sensing performances for H 2 O 2 reduction, glucose oxidation and nitrite oxidation, respectively. Thus, 3D OMC/N-C loaded noble metal nanoparticles are promising materials for a wide spectrum of electrochemical sensor and biosensor applications.
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Journal of Physical Chemistry C
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2021
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IF 4.126
Qinchao Shao,De Zhang,Cai-e Wang,Zhexiang Tang,Mingqiang Zou,Xiaobing Yang,Huaping Gong,Zhi Yu,Shangzhong Jin,Pei Liang
Surface-enhanced Raman scattering (SERS), owing to its high sensitivity and rapid response, has been widely used in various fields. However, it is still a challenge to prepare SERS substrates with high stability and reproducibility. Metal–organic frameworks (MOFs), with excellent enrichment capacity and stability, provide a new material for high-performance SERS substrates. In this paper, we prepare a MIL-101(Cr) film via a secondary growth method, and Ag+ is reduced to Ag NPs by UV irradiation and attach to the film to synthesize the Ag@MIL-101(Cr) film SERS substrate. Then, we change the time of UV light illumination and the amount of silver nitrate in order to obtain the optimal substrate. The detection capability of this sample can be up to 10–11 M for 4-ATP, and the relative standard deviation (RSD) is only about 5%, which demonstrates that the substrate has excellent SERS effect and reproducibility. Finally, the prepared substrate has been applied for the determination of nitrofurantoin, with its detection capability up to 10–7 M. This work proposes a simple method to synthesize MOF-based film substrate with high SERS performance and uniformity and provides potential for the sensitive detection of chemical or antibiotic residue.
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高影响因子
RENEWABLE ENERGY
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2021
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IF 8.001
Huanmei Yuan,Hao Bai,Hao Chen,Zefei Zhang,Haifei An,Weijian Tian
Phase change micro/nanocapsules with high thermal conductivity shells have extensive application prospects in solar energy storage systems and electronics cooling. To improve the heat transfer of the capsules, a method of preparing Ag-shell coated phase change micro/nanocapsules was developed, where the AgBr ultrafine solid particles are introduced to enhance the rigidity of emulsion droplets in the liquid-solid phase transition process, and by employing hydroquinone as the reductant to repeatedly reduce the AgBr that had been adhered to the surface of the emulsion droplets, an Ag shell is formed on the surface of the cores. In this work, palmitic acid (PA) is used as the core material, and the prepared PA/Ag nanocapsules (100–600 nm) exhibit high thermal storage capability and good thermal reliability. The bulk thermal conductivity of the nanocapsules can be as high as 4.072 W/(m·K), indicating that the Ag shell can effectively improve the thermal conductivity of the nanocapsules. Besides, the thermal response of the nanocapsules is estimated by simulating a single-particle heat transfer process considering nanoscale effects , and the results demonstrate that the thermal response time of PA/Ag nanocapsule (350 nm) in working fluid (water, 80 °C) could be as short as 150ns.
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REACTIVE & FUNCTIONAL POLYMERS
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2021
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IF 3.975
Xiaotong Li,Liqin Cao,Bin Wu,Yong Dong,Jide Wang,Liu-ping Chen
Designing efficient nanoparticle-based stabilizer that is suitable for achieving an interconnected porous monolith still remains a challenge. Herein, Ag-nanocomposite poly high-internal phase emulsion (HIPE) template was readily obtained by O/W HIPE, co -stabilized by silver nano powders (Ag-NPs) and polyvinyl pyrrolidone. Cyclohexane as oil phase, N, N ′-methylenebisacrylamide as a crosslinking agent, and free-radical copolymerization of acrylamide (AM) and 2-acrylamide-2-methyl propane sulfonic acid (AMPS) were used in the water phase, which was initiated by potassium persulfate. Thus, Ag-nanocomposite copolymer poly(HIPE)s [Ag/P(AM- co -AMPS)] were obtained via a one-pot synthesis method. The effects of Ag-NP content and different internal phase volume on the porous composites were investigated. The morphology and structures of the composites were characterized, and the average pore size was measured to be approximately 60 μm. Furthermore, the catalytic activity was studied via catalytic degradation of the methylene blue (MB). The decolorization of the MB solution can be completed within 8 min by using the composites containing 5 wt% Ag-NPs. The composite poly(HIPE)s had certain antibacterial activity against E. coli and S. aureus bacteria (9 mm zone of inhibition). Moreover, a compression electric sensitivity ( GF = 2.05) was exhibited with an enhanced electrical conductivity . Thereby, a facile approach to multifunctional macroporous Ag-nanocomposite poly(HIPE) was presented.
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Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 14
·3598-3605
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IF 6.367
Tangxi Chen,Min Zhou,Wen Chen,Yuyao Zhang,Siyong Ou,Yueli Liu
Halide perovskite quantum dots (HP QDs) have been widely used in the field of photocatalysis due to their excellent performance. However, the issues of lead toxicity and instability prevent their process in the photocatalysis application. Herein, the lead-free Cs2AgInCl6 perovskite quantum dots (CAIC QDs) are synthesized by the hot-injection method, and CAIC QDs@Ag composites with various Ag loading amounts are self-assembled by adjusting the Cl source in the synthesis process, which is used to improve the CO2 photoreduction efficiency by using the surface plasmon resonance (SPR) effect of Ag nanoparticles. In addition, the surface ligand density of CAIC QDs@Ag composites is regulated by the purification processing treatment to release the influence of organic ligands on the charge transport performance. It is found that the CAIC QDs@Ag composite with the optimal ligands density possesses fast electron transport and effective carrier separation efficiency, which are crucial for the improvement of the photocatalysis reaction. As a result, the CAIC QDs@Ag-2 composite after purification processing achieves the highest yield of 26.4 μmol g−1 and 28.9 μmol g−1 for CO and CH4, respectively, during the CO2 photoreduction process. In addition, there is no significant decline of CO2 photoreduction performance after the photocatalysis cycling test for 9 h, indicating the good stability of the CAIC QDs@Ag composite in the photocatalysis process.
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VIBRATIONAL SPECTROSCOPY
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2021
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IF 2.507
Ying Chen,Jilin Cao,Hengyong Wei,Zhengang Wu,Xuepei Wang,Yuan Pei
In this study, polyvinyl alcohol (PVA) nanofiber substrates containing silver nanoparticles (AgNPs) were formed by electrospun method. AgNPs were synthesized by in-situ reduction approach under the UV irradiation using PVA as the stabilizer and reductant. SEM, TEM , FTIR, Raman and UV–vis were used to characterize the nanofiber substrates. The results indicated that the average diameter of electrospun flexible PVA/Ag fibers was 250 nm, and the spherical Ag NPs with mean size of less than 10 nm were uniformly embedded into the PVA nanofibers. There appeared a broad absorption peak at 450 nm, which originated from the SPR effect of Ag NPs. The PVA/Ag substrate as-prepared showed the excellent Raman enhancement performance for Rhodamine 6 G detecting. The limit of detection for PVA/Ag SERS substrate was 10 −5 M and the enhancement factor (EF) was 1.58 × 10 5 . Moreover, 20 points were randomly selected for testing and the RSD was 8.81 %, indicating the PVA/Ag electrospun nanofibers SERS substrates had excellent uniformity.
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Biomaterials Science
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2021
·Vol. 9
·期 13
·4728-4736
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IF 6.843
Jun Yang,Lin Sun,Shuhan Hui,Peng Zhang,Jian Li,Dong Wang,Xuelin Wang,Shan Jiang
Severe bacterial infections have brought an urgent threat to our daily life, and photothermal therapy (PTT) has acted as an effective method to kill bacteria. Herein we decorated Ag on the surface of SnS2 (Ag@SnS2), which has outstanding photothermal conversion capability and good biocompatibility. The decoration of Ag on SnS2 improved the absorption of near-infrared (NIR) light in comparison to SnS2, resulting in a temperature increase of 50 °C after 5 min of NIR light irradiation (1.9 W cm−2) and a photothermal conversion efficiency of 31.3%. Ag@SnS2 exhibits almost 100% growth inhibition of E. coli and S. aureus bacteria due to hyperthermia, with a concentration larger than 0.5 mg mL−1 and 5 min of NIR irradiation. Meanwhile, SEM images of treated bacterial cells showed the attachment of Ag@SnS2 on the cell surface and obvious cellular membrane destruction. Ag@SnS2 can also accelerate in vivo wound healing through PTT-induced bacterial disinfection. Therefore, Ag@SnS2 exhibits great potential for photothermal antibacterial application and wound disinfection.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Xin Liu,Mengmeng Fan,Xuguang Zhu,Zengguo Tian,Xin-Jian Li,Hongzhang Song
Bi 2 Sr 2 Co 2 O y with excellent thermoelectric properties has received extensive attention from scientific researchers. In this study, Bi 2 Sr 2 Co 2 O y ceramic samples were prepared using the solid-phase sintering method. By Ag + substitution for Bi 3+ , the hole concentration and electrical conductivity were optimised. On this basis, nano-SiC particles were introduced to increase grain boundaries, improve phonon scattering, reduce the mean free path of phonons, and reduce the lattice thermal conductivity . A sample with a nominal composition of Bi 1.8 Ag 0.2 Sr 2 Co 2 O y + 0.025 wt% SiC had a maximum ZT value of 0.35 at 923 K, which was approximately 67 % higher than the ZT value of pure Bi 2 Sr 2 Co 2 O y . These results confirmed that under the combined action of Ag substitution and SiC doping, the thermoelectric performance of Bi 2 Sr 2 Co 2 O y was significantly improved.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Chao Peng,Xi Xie,Wenkang Xu,Tao Zhou,Ping Wei,Jianbo Jia,Kun Zhang,Yonghai Cao,Hongjuan Wang,Feng Peng,Rui Yang,Xiqiang Yan,Hui Pan,Hao Yu
Steering charge kinetics is one of the most urgent unsolved issues in photocatalysis. The effective spatial separation of photogenerated electron-hole pairs is particularly important in the design and controllable preparation of nano-photocatalysts. Herein, one-dimensional Nb 2 O 5 nanorod arrays with [0 0 1] orientation were grown in-situ on two-dimensional Nb 2 CT x MXenes through a facile hydrothermal method for the first time. Ag nanoparticles were then photodeposited on the Nb 2 O 5 nanorods to form hierarchical 0D/1D/2D nanohybrids. It was experimentally demonstrated that OH is predominantly adsorbed on Nb 2 CT x as termination groups, which resulted in a low work function (2.7 eV). Thanks to the unique structure, the highly active [0 0 1] Nb 2 O 5 nanorods afford high-efficiency photogeneration of electron-hole pairs, while the low-work-function OH terminated Nb 2 CT x allows for trapping holes, and Ag nanoparticles act as electron reservoir and sites of hydrogen evolution reaction (HER). The ternary Ag/Nb 2 O 5 @Nb 2 CT x nanohybrids reached a record HER activity (682.2 and 824.2 μmol·g -1 h −1 use methanol and glycerol as sacrificial agents, respectively) among the niobium-based photocatalysts, demonstrating the potential of MXenes as a platform for the synthesis of high-performance heterojunction structures, where the tunable electronic property is a key factor.
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Journal of Physical Chemistry C
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2020
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IF 4.189
Mengfan Liang,Ziyi Xiong,Yongmao Hu,Yingli Liu,Tao Shen,Shuhong Sun,Yan Zhu
In this article, we prepare corncob-like Cu–Ag and core–shell Cu@Ag bimetallic structures by controlling the concentration of Ag and Cu salts via a galvanic replacement reaction. Moreover, the structure evolution and electrical resistivity of the Cu–Ag corncob nanoparticle deposits were investigated upon heating up to 260 °C by experiments. Afterward, the effect of the distinctiveness and arrangement (such as core@shell, bifacial Janus, and nanowire structure) on the sintering behavior of Cu–Ag systems was investigated by molecular dynamics simulation. The results revealed that both the Ag–Cu ratio and the special structure in the initial stage as well as the sintering temperature play important roles in the morphological formation. Despite limited experimental observation of the structure evolution during sintering, the MD simulation provides a powerful tool to monitor the atom trajectory. The combined information from our experiment and molecular dynamics (MD) results will give guidelines for choosing the preferred structure of Cu–Ag systems when aiming at certain sintering properties.
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