CHEMISTRY-A EUROPEAN JOURNAL
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2016
·Vol. 22
·期 31
·10923-10929
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IF 5.771
Jindi Wang,Guoxin Zhang,Wanxia Sun,Jingsong Sun,Liang Luo,Zheng Chang,Xiaoming Sun
Graphical Ultrastable hybrids : Ag nanoplates/polyethylenimine-modified reduced graphene oxide (AgP/PEI-rGO) hybrids show unexpected higher stability against Cl − and H 2 O 2 than either AgP or mixtures of PEI-rGO and AgP. The AgP/PEI-rGO hybrids show very wide linear response ranges and low detection limits in the electrochemical detection of H 2 O 2 , N 2 H 4 , and NaNO 2 (see scheme). Investigations on Ag nanostructures/reduced graphene oxide composites have been frequently reported, yet the morphology control of those loaded Ag nanocrystals is still challenging. We herein develop a facile method to grow triangular Ag nanoplates (AgP) on polyethylenimine-modified reduced graphene oxide (AgP/PEI-rGO). The AgP/PEI-rGO hybrids show unexpected high stability against chloride ions (Cl − ) and hydrogen peroxide (H 2 O 2 ), which is possibly due to the strong interaction between surface Ag atoms with the amine groups of PEI. In the chronoamperometry measurements for detecting H 2 O 2 , N 2 H 4 , and NaNO 2 , the AgP/PEI-rGO hybrid shows very wide linear ranges (usually 10 −6 –10 −2 mol L −1 for H 2 O 2 , N 2 H 4 , and NaNO 2 ) and low detection limits (down to ≈1×10 −7 mol L −1 ), which demonstrate the promising electrochemical sensor applications of these metal/graphene hybrids with well-defined morphologies and facets. In addition, this strategy could be extended to the deposition of other noble metals on rGO with controlled morphologies.
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RSC Advances
·
2017
·Vol. 7
·期 84
·53157-53163
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IF 3.108
Zhongbo Li,Zhaofang Du,Kexi Sun,Xuan He,Bensong Chen
We report a facile and low-cost approach for fabrication of large-scale surface-enhanced Raman scattering (SERS) active substrates composed of Ag-nanoplates (Ag-NPs) decorated polyacrylonitrile nanopillar (denoted as Ag-NPs@PAN-nanopillar) arrays, via a consecutive process of molding PAN-nanopillar arrays, sputtering Au-nanoparticles onto the PAN-nanopillar arrays as a conducting layer, and decorating the PAN-nanopillars with Ag-nanoplates. The Ag-nanoplate distribution density on the PAN-nanopillars can be tailored by tuning the concentration of citric acid and the Ag-deposition duration, and high SERS sensitivity can thus be achieved by optimizing the density of Ag-nanoplates. The adjacent Ag-nanoplates induced “hot spots” are densely and uniformly distributed in the three dimensional (3D) space around the PAN-nanopillar arrays, and thus Ag-NPs@PAN-nanopillar arrays generated sensitive and homogenous SERS signals when using rhodamine 6G as a probed molecule. Using the Ag-NPs@PAN-nanopillar arrays as SERS substrates, 10−7 M methyl parathion (organophosphorus insecticide) and 10−6 M PCB-77 (one congener of polychlorinated biphenyls belonging to persistent organic pollutants) are identified. Therefore the SERS-active substrates have potential in SERS-based rapid detection of environmental organic pollutants.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Kunjuan Shao,Yanjie Wang,Muzaffar Iqbal,Lin Lin,Kai Wang,Xuehua Zhang,Meng He,Tao He
Modification of a wide-bandgap semiconductor with noble metals that can exhibit surface plasmon effect is an effective approach to make it responsive to the visible light . In this work, a series of cubic and all-edge-truncated SrTiO 3 with and without thermal pretreatment in air are modified by Ag nanoparticles via photodeposition method. The crystal structure, morphology, loading amount of Ag nanoparticles, and optical properties of the obtained Ag-SrTiO 3 nanomaterials are well characterized by powder X-ray diffraction, scanning microscope, transmission electron microscope, energy disperse X-ray spectroscopy, ICP-MS and UV–vis diffuse-reflection spectroscopy. The loading amount and size of the Ag nanoparticles can be controlled to some extent by tuning the photodeposition time via growth-dissolution mechanism. The Ag nanoparticles are inclined to deposit on different locations on the surface of cubic and truncated SrTiO 3 with and without thermal pretreatment. The resultant SrTiO 3 modified by Ag nanoparticles exhibits visible light activity for photocatalytic reduction of CO 2 , which is closely related to the oxygen vacancy induced by thermal pretreatment, size and amount of Ag nanoparticles. Accordingly, there is an optimized photodeposition time for the synthesis of the photocatalyst that exhibits the highest photocatalytic activity.
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Journal of Science-Advanced Materials and Devices
·
2024
·
IF 6.7
Tien Dung Nguyen,Thuy Chinh Nguyen,Xuan Thai Nguyen,Thi Kim Anh Nguyen,Thao Linh Bui,Thanh Thuy Tran,Hoang Thai
Hydrotalcite-Ag nanoparticles (HT-Ag NPs) have garnered significant attention in research due to their remarkable antibacterial activity and excellent photocatalytic properties. Consequently, they have been utilized in various fields, such as pharmaceuticals, medicine, electronics, and environmental treatment. However, the synthesis of HT-Ag nanoparticles often involves the use of NaBH 4 , a chemical reducing agent, to reduce Ag (I) ions and form Ag NPs on HT. Nevertheless, the residue of chemical reducing agents can lead to environmental pollution as above mentioned. The approach of utilizing plant extracts for the synthesis of Ag NPs decorated on HT has captivated many scientists due to its eco-friendly and environmentally sustainable process. Additionally, the plant extract plays a crucial role in stabilizing Ag NPs within HT-Ag structures. This paper presents a green synthesis of hydrotalcite-silver (HT-Ag) nanosheets using an AgNO 3 salt solution as a precursor and areca ( Areca catechu L.) nut extract as a reducing agent. The HT nanosheets, synthesized by a co-precipitation method combined with a hydrothermal method, exhibited an ordered lamellar layer structure. The areca seed extract in 99.5 % ethanol solvent acts as a reducing agent to convert Ag(I) ions into silver nanoparticles (Ag NPs). The presence of Ag NPs on the surface of HT nanosheets was confirmed using UV–Vis spectroscopy, XRD, AAS, HR-TEM, and SEM methods. The results indicated that Ag NPs are spherical in shape and uniformly dispersed on the surface of HT. The particle size of Ag NPs ranged from 15 nm to 40 nm. The yield of the Ag NPs synthesis process on HT ranged from 60.79 % to 85.89 %, depending on the concentration of AgNO 3 salt solution. The antibacterial properties, including their effectiveness against E. coli and S. aureus , were tested using the agar well diffusion method to determine the zone of inhibition. The minimum inhibitory concentration (MIC) value of HT-Ag nanosheets has also been evaluated. Specifically, the study focused on evaluating the antibacterial activity of HT-Ag nanosheets using a marine Gram-negative bacterium, P. stutzeri B27, to explore their potential applications in materials designed for use in marine environments. Furthermore, the durability of HT-Ag nanosheets was assessed. The obtained results demonstrated that the Ag NPs decorated on HT exhibited excellent antibacterial activity against E. coli , S. aureus , and P. stutzeri B27, making them suitable for applications as antibacterial and enhancing additives for polymer systems, particularly in materials used in marine environments.
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POLYMER
·
2024
·
IF 4.1
Zecheng Cao,Xiaojiao Kang,Wei Lü,Hongcheng Wang
With the advancement of economic development and the increasing complexity of commodity distribution, efficient and precise anti-counterfeiting measures have garnered significant attention in recent decades. This challenge necessitates the development of flexible films exhibiting both superior mechanical and optical properties to accommodate various anti-counterfeiting applications. This study introduces a composite film comprised of waterborne polyurethane (WPU), gelatin quantum dots (QDs), and glycerol. Glycerol, employed as a plasticizer, enhances the film's plasticity by disrupting hydrogen bonds within the matrix. The tensile strength decreased from 7.7 MPa to 1.73 MPa, while the elongation at break increased from 410 % to 656 %, compared to the samples without glycerol. The resulting films exhibit advantageous properties, including facile preparation, high transmittance, excellent optical properties, and excellent mechanical performance. Additionally, the photoluminescence intensity decreased by only 15 % after being placed in air for 30 days. They demonstrate commendable stability under ambient temperature and environmental conditions, making them suitable for diverse and intricate anti-counterfeiting applications. The emission wavelength of the composite films was tuned by adjusting the cation ratio of the QDs, and the mechanical properties can be adjusted by varying the QD and glycerol contents. This work offers valuable insights for the development of advanced flexible materials for anti-counterfeiting purposes.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Xiangyang Zhao,Lingling Wang,Yawei Wang,Xingyu Zhang,Rong Fang,Yue Zhou,Rui Guo,Xintong Zhang,Yichun Liu
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells are considered a promising new type of film cell, due to their rich elemental reservation and excellent photovoltaic performance. However, the deleterious defects at the heterojunction interface severely hinder charge transport, separation, and extraction, significantly limiting the photovoltaic performance of CZTSSe solar cells. In this study, a simple method involving the incorporation of Cd 2+ and Ag + dual-ion at the heterojunction interface was proposed to reduce interfacial defects. The results showed that Cd 2+ and Ag + dual-ion interface deposition effectively reduced the [2Cu zn + Sn zn ] harmful defects near the heterojunction interface and subsequently reduced the number of recombination centers in the interface. This led to improved carrier recombination at the interface. Meanwhile, the devices achieved a wider depletion width, which was more favorable for carrier collection. Ultimately, the conversion efficiency increased by 32.81 %. This simple interface dual-ion deposition strategy offers a promising strategy for further enhancing the efficiency of CZTSSe cells.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hu Li,Yingying Peng,Weixiang Zhou,Jun Guo,Chao Gao,Yapeng He,Mingxi Pan,Congqing Yang,Hui Huang
In the development of back electrodes for perovskite solar cells (PSCs), the major challenges are stability and cost. To address this, we present an innovative approach: Simultaneous evaporation of two independently controlled sources of metal materials was performed to achieve a uniform distribution of the alloy electrodes. In this study, Ag–Cu alloys (the molar ratio of Ag/Cu is 7/3) with a high-index crystal face (111) and a work function matching perovskite were prepared using a codeposition technique. These properties mitigate nonradiative carrier recombination at the interface and reduce the energy barrier for carrier migration. Consequently, compared to Ag based PSCs (22.77%), the implementation of Ag–Cu alloy (Ag/Cu is 7/3)-based PSCs resulted in a power conversion efficiency of 23.72%. In a 1500 h tracking test in ambient air, the Ag–Cu alloy (Ag/Cu is 7/3)-based PSCs maintained their initial efficiency of 86%. This can be attributed to almost no migration of elements from the Ag–Cu alloy electrode to the perovskite layer. Our work presents a vital strategy for improving the stability of PSCs and reducing the costs associated with the back electrode in PSCs.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chengjun Li,Wang Li,Chengwei Sun,Zheng Ma,Yingchao Wei,Wenyuan Ma,Boyu Yang,Xin Li,Yubo Luo,Junyou Yang
Bi2Te3-based thin films are gaining recognition for their remarkable room temperature thermoelectric performance. Beyond the conventional “process–composition–performance” paradigm, it is highly desirable to explore new methods to enhance their performance further. Here, we designed a sandwich-structured Ag/PZT/PVDF/Bi0.5Sb1.5Te3(BST) thin film device and effectively regulated the performance of the BST film by controlling the polarization state of the PZT/PVDF layers. Results indicate that polarization induces interlayer charge redistribution and charge transfer between PZT/PVDF and BST, thereby achieving the continuous modulation of the electrical transport characteristics of BST films. Finally, following polarization at a saturation voltage of 3 kV, the power factor of the BST film increased by 13% compared to the unpolarized condition, reaching 20.8 μW cm–1 K–2. Furthermore, a device with 7 pairs of P–N legs was fabricated, achieving a cooling temperature difference of 11.0 K and a net cooling temperature difference of 2.4 K at a current of 10 mA after the saturation polarization of the PZT/PVDF layer. This work reveals the critical effect of introducing ferroelectric layer polarization to achieve excellent thermoelectric performance of the BST film.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yanting Guo,Qing Li,Lu Zheng,Dandan Liu,Guangming Nie
A highly sensitive humidity sensor based on Ag doped polyindole/hydroxyethyl cellulose (Ag-PIn/HEC) composite is constructed for relative humidity sensing at room temperature in this study. Doping of Ag and HClO 4 is used to solve the problem of poor electrical conductivity of polyindole (PIn). The humidity sensitive material is prepared by the combination of HEC binder and doped PIn, which realizes the high sensitivity humidity detection. The Ag-PIn/HEC sensor showed high response value (93800 %), good linearity (R 2 = 0.993), fast response time (8 s), low humidity hysteresis (4.16 %), good reproducibility, and stability over a detection range of 11 ∼ 84 % relative humidity (RH). In addition, the humidity sensor has a specific response to human breath. According to the change of impedance signals, it can easily distinguish between oral and nasal breathing as well as light or rapid breathing, which can be used in medical care, such as preventive monitoring for special groups (asthma patients). Moreover, the sensor can recognize certain simple words by detecting changes in exhalation while speaking, which provides potential applications in speech recognition and non-contact switches.
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Analytical Methods
·
2024
·Vol. 16
·期 10
·1489-1495
·
IF 2.7
Lingyan Shi,Wei Liu,Xuan He,Zihan Wang,Weiping Xian,Jie Wang,Sheng Cui
High fluorescence background poses a substantial challenge to surface-enhanced Raman scattering (SERS), thereby limiting its broader applicability across diverse domains. In this work, silver nanoparticle (Ag NP)-loaded graphene oxide aerogel nanomaterials (GO-Ag ANM) were prepared for sensitive SERS detection of fluorescent explosive 2,4,8,10-tetranitrobenzo-1,3a,6,6a-tetraazapentaenopyridine (BPTAP) by a fluorescence quenching strategy. By harnessing the fluorescence quenching properties of graphene and the localized surface plasmon resonance of silver nanoparticles, the synthesized aerogels exhibited effective fluorescence quenching and Raman enhancement capabilities when employed for BPTAP analysis with 532 nm laser excitation. Significantly, precise control over the loading quantity of silver nanoparticles (Ag NPs) resulted in the remarkable sensitivity of the surface-enhanced Raman scattering (SERS) effect. This method allowed for the detection of fluorescent explosive BPTAP at an extraordinarily low concentration of 1 × 10−7 M. Furthermore, the approach also demonstrated excellent detection capabilities for the dyes R6G, CV, and RhB. This study offers valuable insights for the sensitive detection of fluorescent molecules.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Guanwei Tao,Jiajun Li,Xinping Zhang
We report a new SERS sensor based on the hybridization of the laser-induced graphene (LIG) and silver nanoparticles (AgNPs). LIG was produced by direct laser writing on a PI film. AgNPs were produced on the LIG surface by thermal evaporation of silver. The porous-structured LIG layer increases largely the total surface area of the substrate and supplies delocalized π bonds for the enhancement of the adsorption of the target molecules to the LIG surface. Furthermore, LIG also provided the chemical enhancement mechanism. The high-density hotspots supplied by AgNPs on the LIG surface in such a hybrid scheme are the main mechanism for the SERS sensing. In particular, strong surface morphology depending on the Ag-deposition thickness and deposition rate enables modification of hydrophobicity of the SERS substrate, which gives additional channels for improving the SERS performance. Theoretical analysis on the distribution of the optical electric field facilitates the determination of the optimized Ag thickness and the deposition rate. These multifold enhancement mechanisms produced a SERS enhancement factor of 3.19 × 10 5 , which enables high-sensitivity detection of the banned dyes (CV, MG) in aquatic products. Strong Raman signals were detected with high contrast for a concentration as low as 10 −7 M. This sensor also has potentials for on-site detection in various application circumstances.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Chaoqiang Li,Xiangyu Xu,Aizhong Jia
Photocatalytic reduction of CO 2 to chemical fuels is a promising strategy to alleviate the greenhouse effect and energy crisis. This article successfully fabricated Ag/CdS composites with ohmic junction using a two-step method and further verified them by DFT calculations. Meanwhile, photoelectrochemical and electron paramagnetic resonance tests show that Ag/CdS has higher photocurrent density and lower charge transfer resistance, suggesting that the ohmic junction achieves ultrafast electron transfer from CdS to Ag under light irradiation, significantly promoting the separation of photogenerated carriers. Furthermore, the localized plasmon resonance (LSPR) of Ag enhances the light absorption of the catalyst and generates a large number of hot electrons for the photocatalytic reduction reaction. The synergistic effect of ohmic junction and LSPR gives high electron density at the reaction site, which promotes the multiple proton-coupled electron reactions leading to highly selective photoconversion of CO 2 to CH 4 . Under the optimized conditions, the CH 4 yield of the synthesized Ag/CdS is 68.6 μmol·g −1 ·h −1 , which is 25.4 times higher than that of bare CdS, and the CH 4 selectivity increases from 53.8% to 90.1%. This study provides a new idea for the design of CdS-based materials for highly selective reduction of CO 2 to CH 4 .
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