SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Weiwei Meng,Lei Dai,Yuehua Li,Zhangxing He,Wei Meng,Huizhu Zhou,Ling Wang
Mixed potential NH 3 sensors with La 9.95 K 0.05 Si 5 AlO 26.45 (LKSAO) as the solid electrolyte and Bi 1-x Ag x VO 4- δ as the sensing electrode (SE) were developed. Bi 1-x Ag x VO 4- δ was produced by solid state reaction and then characterized by XRD, XPS, SEM and EDS. As revealed from the results, The BiVO 4 samples exhibit an unchanged crystalline structure after Ag doping molar amount x≤0.2, accompanied by the growth of the particle. The sensor based on Bi 1-x Ag x VO 4 - δ exhibit the noticeably enhanced sensing performance to NH 3 in contrast to the sensor using BiVO 4 , including its larger response potential (Δ V ) and higher sensitivity. For instance, the sensors based on BiVO 4 and Bi 0.8 Ag 0.2 VO 4 - δ at 400 °C exhibit the sensitivities of -28.1 and -77.3 mV/decade, respectively. Nevertheless, by Ag doping, there is no effective improvement of the anti-interference ability of the sensor against NO and NO 2 . To address the mentioned problem, CuO, NiO and La 0.8 Sr 0.2 MnO 3 (LSM) were used as reference electrodes (RE). As suggested from the results, using CuO and NiO as the reference electrodes can obviously reduce the cross-sensitivity of the sensor to NO and NO 2 , whereas the sensitivity slightly decrease.
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FOOD CHEMISTRY
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2020
·
IF 6.306
Long Wu,Weimin Zhang,Chen Liu,Mohamed F. Foda,Yongheng Zhu
In this work, based on the strawberry-like SiO 2 /Ag nanocomposites (SANC) immersed filter paper, a newly surface-enhanced Raman scattering (SERS) substrate was constructed for the detection of acrylamide (AAm) in food products. To construct filter paper-based SANC (F-SANC) SERS substrates, SiO 2 nanoparticles (SNP) were firstly synthesized and acted as carriers. After that, the in-situ preparation of silver nanoparticles (Ag NP) on SNP surface was carried out to form the strawberry-like three-dimensional (3D) structure of SANC. Finally, SANC were entangled into the filter paper to produce nanoarchitecture, thus providing enhanced plasmon resonance between SANC with strong SERS signal. Under the optimized conditions, the method exhibited good performance toward AAm with a vast linear response from 0.1 nM to 50 μM (R = 0.9935), limit of detection (LOD) of 0.02 nM (S/N = 3), and the recoveries of 80.5%~105.6% for practical samples. This strategy showed good robustness in the rapid and sensitive detection of AAm, which could be a promising strategy in food analysis and verification.
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PubMed
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Su Ding,Zhi Jiang,Fei Chen,Li Fu,Yanfei Lv,Yahui Qian,Shichao Zhao
Transient conductors are one of the most important components in transient electronics, which attract great attention because of their environment-friendly and biocompatible characters. To meet the requirement for wearable electronics, good stretchability and mechanical durability are needed for the transient conductors. However, it remains challenging to achieve stretchability and transient behavior simultaneously because of a lack of the proper elastomer. Herein, we demonstrate the first highly stretchable and transient conductor from a composite material of Ag flakes and gelatin hydrogel. It shows a maximum stretchability of more than 100% with minimal resistance increase and a good cyclic durability of 1000 cycles of deformation at 20%. The above mentioned good mechanical properties come from the rational design of the conductor with a seamless interface between the hydrogel and Ag flakes. When the conductor is immersed in water at 60 °C, it can be quickly dissolved within 90 s, and the transient behavior can be controlled by tuning the content of the hydrogel in the conductors and dissolving temperature. These properties make the conductor a good wiring candidate for stretchable and transient electronics.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yi Li,Lu Yu,Jiansheng Li,Lianjun Wang,Rui Lu
The preparation of surface-enhanced Raman scattering (SERS) substrate with both structural stability and SERS activity under extreme pH conditions faces several problems, including tedious preparation, time consuming processes, high cost, and the need for professional equipment and personnel. Herein, a facile preparation protocol for a large-scale nanoarray film substrate was developed for multi-purpose SERS sensing. Through a simple self-assembly process under specific conditions, well-ordered, highly sensitive, structurally tunable, acid-alkali resistant and disposable “polyamide@Ag” coralloid nanoarrays were fabricated. Due to the dense distribution of AgNPs on the top and side surfaces of the nanoarrays and optimized geometric construction, a large number of controllable Raman “hotspots” formed in the space, resulting in excellent Raman signal uniformity and SERS performance for Rhodamine 6G. To evaluate the potential application of this flexible substrate, it was implemented in the label-free trace determination of folic acid with a limit of detection as low as 5.24 × 10 −12 M. Importantly, the as-prepared polyamide@Ag nanoarrays exhibited high structural stability over a wide pH range from 1.25 to 12.00, which is beneficial for the detection of non-pH-neutral samples. The results demonstrated that this hybrid substrate has broad application prospects in fields as diverse as biosensing and environmental monitoring.
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CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Lei Chen,Chun Li,Xiaoqing Si,Xiaoyang Wang,Zhiquan Wang,Jian Cao
Based on reactive air brazing (RAB), we designed a new type of sealant (Ag–xCuAlO 2 ) for joining 3 mol.% yttria-stabilized zirconia (YSZ) ceramics and AISI 310S stainless steel. The CuAlO 2 content affected the wettability of the sealant on the YSZ surface, and the joints had a high shear strength when Ag–2 wt.%CuAlO 2 , which had a small contact angle on the YSZ substrate, was used as the sealant. In addition, the thickness of the oxide layer was reduced compared to that for the Ag–CuO sealant. The effects of the processing parameters on the microstructure and shear strength of the joints were investigated, and the as-brazed joints reached their highest shear strength (93.7 MPa) when brazed at 1040 °C for 30 min. After high-temperature oxidation at 800 °C for 200 h, the shear strength of the joints remained at 50 MPa, and no apparent change in the microstructure was observed, proving that the joints possessed excellent oxidation resistance .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yan Zhu,Fang Zhou,Junqiang Hu,Longlai Yang,De-Quan Yang,Edward Sacher
Colorless Ag-Cu nanoparticle (NP) dispersions have been prepared by heating polyvinyl pyrrolidone (PVP)- polyvinyl alcohol (PVA)-stabilized Ag NPs with Cu ions . They were characterized by TEM photomicrographs and UV-Visible spectroscopy. They showed high stability, and enhanced antibacterial effects against S. aureus , P. aeruginosa , E. coli and C. albicans . The antibacterial order decreased from Ag-Cu NPs to Ag NPs + Cu ions, to unheated Ag NPs, to heated Ag NPs.
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OPTICAL MATERIALS
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2021
·
IF 3.08
Xinli Wang,Jin Li
The development of metal/semiconductor photoactive materials has progressed remarkably with respect to heterogeneous photocatalysis . In this study, pristine ZnO quantum dots (ZQ) and Ag/ZQ nanocomposites with different Ag loadings were prepared using a cost-effective method. The synthesized samples were characterized using X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and electron paramagnetic resonance analyses. Photocatalytic experiments indicated that the Ag11/ZQ nanocomposite (Ag content of 11 wt%), exhibited excellent photocatalytic activity for methylene blue degradation. A combination of ultraviolet–visible spectroscopy, photoluminescence spectroscopy, electrochemical impedance spectroscopy , time-resolved photoluminescence analyses, and analog computational analysis were employed to propose the mechanism underlying the enhanced photocatalytic activity of Ag/ZQ nanocomposites. This was attributed to the effective charge transfer to the surface-decorated Ag, which efficiently suppresses electron–hole recombination in the ZQ, as well as oxygen vacancies (V O ) on the ZQ surface provide more reactive sites. Consequently, Ag/ZQ nanocomposites are promising photocatalytic materials for the removal of organic pollutants from wastewater.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Yingying Dong,Tao Wang,Shui Hu,Ying Tang,Xiaotong Hu,Yaoyao Ye,Hui Li,Ding Cao
The efficient electrochemical synthesis of ammonia (NH3) is a topic of great concern in theoretical research and in various industries. However, given the limitations of high-performance catalysts, achieving high NH3 yields from the electrocatalytic N2 reduction reaction (ENRR) remains challenging. In this work, we report that a Ag-doped titanium dioxide (TiO2) nanofiber catalyst synthesized by a simple electrospinning method could effectively convert N2 into NH3 at room temperature. The Ag-doped TiO2 nanofibers had a high NH3 yield rate of 3.158 × 10–10 mol s–1 cm–2 with a Faradaic efficiency (FE) of 0.13% at a low overpotential of −0.6 V versus a reversible hydrogen electrode (RHE) in acidic solution (0.1 mol L–1 HCl). The absence of hydrazine in the system proved that the prepared catalyst has excellent selectivity. Operation for eight consecutive cycles at an overpotential of −0.6 V vs RHE demonstrated the high stability of the Ag-doped TiO2 nanofibers without obvious variations in the NH3 yield rate and FE. The current density in the chronoamperometric curve did not decrease remarkably over 12 h of continuous electrolysis, thus confirming the durability of the catalyst. This work proves that Ag/TiO2 nanofibers may be a highly efficient ENRR catalyst that could achieve high NH3 yield rates. The unique structure of the interface between Ag and TiO2 in the Ag/TiO2 nanofibers prepared by electrospinning not only enhances the adsorption of N2 but also promotes electron exchange and the synergy between the nanofibers and N2.
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MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Wenzhi Zhang,Tian Jiang,Xiuxiu Sun,Ani Zhou,Maoguo Li
Peracetic acid (PAA) is commonly used as the strong oxidant in many areas. However, high concentration of PAA can be harmful to health of people. The quantitative determination of PAA is of great significance. Here, a metal–organic framework (MOF) is introduced into the electrochemical sensor for PAA detection. The influence of common transition metal centers on the performance of electrochemical detection of PAA was investigated and the results showed the Cu-1,3,5-trimesic acid (Cu-BTC) was the best original MOF. Ag nanoparticles were decorated in the Cu-BTC to further improve the electrocatalytical activity. The concentration of the added Ag salt and the quality of the reducing agent tannic acid (TA) had a great impact on the performance. The final sample optimized for the synthesis conditions was named as Ag NPs/Cu-BTC. The electrochemical sensor based on Ag NPs/Cu-BTC/GCE was fabricated for sensing PAA with a wide linear range (0.1–5000 μM), low detection limit (0.046 μM, S/N = 3) and high sensitivity (1013.4 μA mM −1 cm −2 ). The water stability of Ag NPs/Cu-BTC and the anti-interference ability of the sensor were good. The electrochemical sensor could be applied in detecting the concentration of PAA in the commercially available peracetic acid, suggesting the practical application value.
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RSC Advances
·
2019
·Vol. 9
·期 52
·30125-30133
·
IF 3.049
Lili Xu,Hongbo Suo,Renmin Liu,Houmei Liu,Hongdeng Qiu
In this study, a novel magnetic composite (Fe3O4@CS/GO/Ag) modified with chitosan (CS), graphene oxide (GO) and Ag nanoparticles (Ag NPs) was successfully prepared as an efficient adsorbent for detection of rhodamine B (RB) combined with a fluorescence technique. The properties of the magnetic composite were confirmed by field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and vibrating sample magnetometry. The components of Fe3O4@CS/GO/Ag endowed it with excellent extraction performance and convenient operation. The main parameters affecting extraction and desorption efficiency were all investigated systematically. Under the optimized experimental conditions, the proposed method showed linear ranges (0.2–6.0 μg L−1) with R2 = 0.9992. The limits of detection (LODs) and quantification (LOQs) were 0.05 and 0.2 μg L−1 (n = 3), respectively. Fe3O4@CS/GO/Ag exhibited outstanding extraction efficiency for RB, compared with CS-coated Fe3O4 nanoparticles (Fe3O4@CS) and GO-modified Fe3O4@CS (Fe3O4@CS/GO). The applicability of the proposed method was investigated by analyzing four real samples (waste water, soft drink, shampoo, and red pencil) and the spiked recoveries ranged between 94% and 97% with RSD ranging from 3% to 6%, which showed that the proposed method had satisfactory practicability and operability.
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JOURNAL OF ELECTRONIC MATERIALS
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2019
·Vol. 49
·期 3
·1819-1826
·
IF 1.676
Gu Kang,Hao Ruiting,Guo Jie,Aierken Abuduwayiti,Liu Xinxing,Chang Faran,Li Yong,Wei Guoshuai,Liu Bin,Wang Lu,Sun Shuaihui,Ma Xiaole
In this work, the (Ag,Cu) 2 ZnSnS 4 (ACZTS) thin films were fabricated via sputtering with a multi-target to form different layer stacks, i.e., (S1) ZnS/Sn/Cu/Ag/Mo,(S2) ZnS/Sn/Ag/Cu/Mo and (S3) ZnS/Ag/Sn/Cu/Mo. The stacked precursors were sulfurized through a soft annealing, followed by a two-step sulfurization in a chamber filled with N 2 at standard atmospheric pressure. The x-ray photoelectron spectroscopy elemental profile showed a vertical non-uniform distribution of Ag in the film. Based on the results of scanning electron microscopy and electron probe microanalysis, Ag enrichment of the upper surface was beneficial for the grain size. Moreover, a dense, uniform surface could be obtained and the stability of the elemental composition could be maintained. After optimizing the order of the Ag layers, the efficiency of the solar cells increased from 1.30% to 3.65%, an improvement of 181%. The open circuit voltage is increased from 448 mV to 630 mV because of the reduced voids, increased grain size, and reduced Cu Zn antisite defects.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 10
·1-10
·
IF 2.009
Jiang Xinde,Wang Zhenxi,Zhang Xiaohang,Jiang Guixian,Peng Yong,Xu Sheng,Cao Meng,Dai Xin,Liu Zuhan,Ma Jianye
A green bioreduction method was used to prepare highly efficient supported TiO 2 photocatalysts with bimetallic (Au-Ag) nanoparticles at room temperature using Cinnamomum camphora leaf extract as both the protective agent and reducing agent. The resulted Au-Ag/TiO 2 exhibits high photocatalytic activity toward the degradation of organic dyes. It was demonstrated that after some of the biomolecules were removed through ionic-liquid extraction and/or calcinations, the Au-Ag/TiO 2 photocatalyst exhibits significantly enhanced catalytic performance toward the degradation of methyl orange compared to the pristine untreated catalyst. As a result, 300 mL of 20 mg/mL methyl orange can be fully degraded in 30 min. These can be explained by the sufficient biomolecules could protect the nanoparticles stay in small size, but excess biomolecules played an unfavorable role in hindering the electron transportation during the catalytic reaction. The low-cost preparation, the high activity, together with the good stability and recyclability make this developed Au-Ag/TiO 2 a promising photocatalyst toward the degradation of wastewater.
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