JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Jinxin Wei,Zhe Hu,Wenjie Zhou,Yi Qiu,Hanqing Dai,Yuanyuan Chen,Zhongjie Cui,Siyu Liu,Haiyang He,Wanlu Zhang,Fengxian Xie,Ruiqian Guo
With the blooming development of zero-dimensional nanomaterials , I-III-VI alloying quantum dots (QDs) with outstanding photoelectrical properties have emerged to attract much attention as promising environmentally-friendly substitutions for conventional binary Cd-based QDs. In this work, a facile one-pot method was introduced to synthesize unreported quaternary Ag-Cu-Ga-Se/ZnSe (ACGSe/ZnSe) QDs. A relatively high photoluminescence quantum yield (PL QY) of 71.9% and a tunable emission from 510 to 620 nm were successfully achieved. We explored the roles of alloying compositions in ACGSe/ZnSe QDs, inferring that increased Ag proportion would not only lower the V defect level which leads to the blue shift of emission, but also slow the ZnSe shelling process owing to the larger lattice distortion. At last, the white light-emitting diodes (WLEDs) were fabricated with ACGSe/ZnSe QDs as the conversion layer, indicating that the as-prepared QDs are a promising candidate for further applications.
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PubMed
高影响因子
ACS Catalysis
·
2021
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IF 13.084
Jie Ding,Liang Huang,Guojing Ji,Yuewu Zeng,Zhaoxu Chen,Eric G. Eddings,Maohong Fan,Qin Zhong,Harold H. Kung
The effect of addition of Ag to the catalytic properties of hollandite manganese oxide (HMO) was investigated for the oxidative acetalization of ethanol to diethoxyethane. Based on analysis with HRTEM, XRD, and EXAFS, Ag introduced onto HMO by deposition/precipitation was found to be present in different forms in the final catalyst depending on the calcination temperature. It could exist as nanoparticles on the outside surface of HMO nanorods for samples calcined at 60 °C, and as Ag atoms intercalated into the tunnels of the HMO structure for samples calcined at 500 °C. NH3 desorption results showed that intercalation of Ag resulted in stronger Lewis acidic sites on HMO, which DFT computational results suggested to be due to Ag-induced electron redistribution in the HMO framework. The intercalation of Ag atoms also made the HMO more easily reducible by lowering the H2 reduction temperature from 500 to 200 °C. Consequently, the sample with intercalated Ag was more active for ethanol oxidation to acetaldehyde, achieving nearly 100% conversion of ethanol and acetaldehyde by 360 °C, and acetalization of acetaldehyde with ethanol to produce diethoxyethane selectively, resulting in 93.5% diethoxyethane yield, which was 10% higher than with samples containing Ag nanoparticles on HMO. This study demonstrated a little-studied phenomenon in which a metal alters the catalytic properties of an oxide electronically but not structurally and without direct participation in the reaction.
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FIBERS AND POLYMERS
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2021
·Vol. 23
·期 2
·386-395
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IF 2.153
Xu Qingbo,Wang Peng,Zhang Yanyan,Li Changlong
k]Immobilizing inorganic particles such as zinc oxide (ZnO), titanium dioxide (TiO 2 ), silver nanoparticles (Ag NPs) or grafting special biopolymer such as chitosan on cotton fabrics is the main method to prepare antibacterial and ultraviolet (UV) protective cotton fabrics. However, poor durability and complex finishing methods are still of the main defects of antibacterial and UV protective fabric samples. In the present work, the Ag/TiO 2 colloid solution was prepared with using the carboxymethyl chitosan (CMC) as a stabilizer, then the CMC and Ag/TiO 2 composite nanoparticles were coated on the fabric via finishing technology of pad-dry-cure. As a result, the modified fabric showed excellent antibacterial and UV protective properties, with the values of bacterial reduction (BR) and ultraviolet protection factor were reached at 99.5 % and 79.0, respectively. Moreover, even after 50 washing cycles, these properties of the finished fabrics were not obviously reduced. These results demonstrated that the finished fabric sample has durable antibacterial and UV protective properties which could has a great potential application in the field of medical and outdoor apparel.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
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IF 4.291
Ao Li,Linbei Xie,Sijie Zhou,Min Zhang,Yi Ding,Ping Wang
In this study, the magnetic core-shell nanomaterial Fe 3 O 4 /SiO 2 /N-TiO 2 /Ag/AgCl (FSNT/Ag/AgCl) that efficiently degraded methyl orange (MO) was produced. The dosages of tetrabutyl titanate (TBOT), urea and AgNO 3 were optimized by response surface methodology (RSM). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), fourier transform infrared spectrometer (FT-IR), and UV–vis diffuse reflectance spectrum (UV–vis DRS) were used to characterize the nanomaterial. The particle size of FSNT/Ag/AgCl was 91.98 nm, and it presented a core-shell structure with Fe 3 O 4 as the core, SiO 2 and N-TiO 2 wrapped in Fe 3 O 4 , and Ag/AgCl deposited on the outermost layer. Performance and mechanism research experiments showed that under the optimized conditions of 1 g/L FSNT/Ag/AgCl, pH = 9, temperature of 35℃ and initial MO concentration of 10 mg/L, about 90 % of MO was degraded in 20 min. The mineralization rate was 35.2 % within 120 min. Holes (h + ) and superoxide anions (·O 2 − ) were the main active substances in the whole photocatalytic degradation. FSNT/Ag/AgCl could be recovered by magnet. After 5 repeated experiments, the degradation rate of MO within 100 min still reached 88.5 %. This work provides a recyclable core-shell nanomaterial for faster degradation of dye wastewater.
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Journal of Materials Research and Technology-JMR&T
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2021
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IF 5.039
Chengli Yao,Xinna Gao,Xuan Liu,Yuhua Shen,Anjian Xie
It is a challenging and valuable work to synthesize surface enhanced Raman scattering (SERS) substrate with low cost and high performance by simple methods, and use it to detect pesticide residues in food. Here, Ferrero® chocolate-like Cu 2 O@Ag microspheres (FRC-Cu 2 O@Ag) were fabricated by a facile in-situ redox reaction. Cu 2 O directly acted as templates and reducing agents to induce the nucleation and growth of Ag nanoparticles on the microspheres surfaces. The prepared semiconductor-noble metal hybrids of Cu 2 O@Ag were utilized as SERS substrates to detect 4-mercaptobenzoic acid (4-MBA) and thiram molecules. The distinguished SERS effect was achieved when target molecules absorbed on the FRC-Cu 2 O@Ag composite. The substrate presented excellent sensitivity and reproducibility for the detection of 4-MBA and thiram with the limit of 10 −10 and 10 −9 M, respectively. Due to combining both advantages of electromagnetic enhancement of Ag metals and chemical enhancement of Cu 2 O semiconductors, the obtained FRC-Cu 2 O@Ag microspheres provided a SERS platform to conveniently detect molecules with thiol groups. When it was applied to detect thiram residues on apple peel and the detection limit was 1.2 × 10 −7 M, low than maximal residue limit (MRL) of 7 × 10 −6 M in fruit prescribed by the U.S. Environmental Protection Agency (EPA).
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Wenlong Liao,Kunpng Liu,Yangjie Chen,Jianping Hu,Ya Gan
Three-dimensional (3D) SERS substrates have being intensively investigated since they can afford substantial hot spots and trap targets exponentially, silicon nanowires (SiNWs) array is a promising candidate due to its facile preparation. Most often, the SiNWs based substrates were decorated with pure Ag or Au nanoparticles (NPs), Au–Ag bimetallic NPs (BMNPs) with superior plasmonic properties and stabilities are rarely studied for the fabrication of SiNWs based SERS substrates. In this work, we reported a facile method to fabricate Au-Ag BMNPs decorated SiNWs as 3D SERS substrates, the effects of Au-Ag BMNPs scale and composition ratios on SERS performance were well investigated through experiments and theoretical simulations. The vertically aligned SiNWs coated with dense Au-Ag BMNPs further improved the sensitivity by forming fixed and dynamic hot spots, and the detection limit of R6G on SiNWs-AuAg can be as low as 10 -12 M by using a portable Raman spectroscopy . Meanwhile, the prepared 3D SERS substrate showed a higher SERS enhancement factor (EF) and oxidation resistance ability due to the synergistic effect of Au and Ag atoms in Au–Ag BMNPs. Considering the facile fabrication process and excellent performances, the prepared 3D SERS substrate can be potentially applied for ultrasensitive detection of trace analytes.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
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IF 3.927
Hongjun Fang,Yusong Pan,Haixian Yan,Linfeng Xu,Chengling Pan
Novel plasmonic photocatalysts have been extensively investigated because of their advantages in efficient light absorption and surface plasmon resonance effect (SPR). Herein, plasmon-induced BiPO 4 /Ag/Ag 3 VO 4 heterostructures were constructed by in-situ partially reduction along with hydrothermal approach. Photo-degradation results revealed that BiPO 4 /Ag/Ag 3 VO 4 -1.2 (abbreviation as Bi/Ag-1.2) product presented a significant enhancement of photoactivity for Methyl orange-MO, Congo red-CR and tetracycline-TC degradation under visible light irradiation, which was higher than that of pristine BiPO 4 and Ag/Ag 3 VO 4 , respectively. Moreover, this excellent performance of Bi/Ag-1.2 was mainly ascribed to the synergistic effect consisting of intimate heterostructure between BiPO 4 and Ag/Ag 3 VO 4 and SPR effect of Ag, thus ensuring an accelerated separation and transfer of photo-generated carriers and promoting the absorbance of visible light. The trapping test and electron spin resonance further demonstrated that h + and ·O 2 − species are the vital active species in the photocatalytic reaction. Meanwhile, a plausible photocatalytic mechanism induced by plasmon-based heterojunctions was systematically proposed.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 35
·16683-16696
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IF 3.553
Qi Jiqiu,Ruan Chenya,Hu Rui,Sui Yanwei,He Yezeng,Meng Qingkun,Wei Fuxiang,Ren Yaojian,Wei Wenqing
Flexible wire-shaped supercapacitors have attracted wide interest due to the increasing demand for portable and wearable electronics. Due to the complex functioning atmosphere of wearable electronics, their mechanical stability and electrochemical stability under different bending states are required. In this work, the self-made Ag-coated cotton wire was adopted as the collector and zinc–cobalt layered double hydroxide nanosheets were successfully electrodeposited on this wire (Ag-CW@ZnCo-LDH) by a facile chronopotentiometry with a constant current of 0.02A. Ag-CW@ZnCo-LDH electrode displayed a high specific capacitance of 1732.4 F g −1 at 1 A g −1 and 61.7% of capacitance retention after 2000 cycles at 10 A g −1 . Flexible wire-shaped symmetric supercapacitor was fabricated by two same Ag-CW@ZnCo-LDH electrodes, which exhibited a working potential window of 1.2 V. The as-assembled WSSC showed a good electrochemical performance with specific capacitance of 16.3 F g −1 and energy density of 1.33 Wh kg −1 at power density of 1224 W kg −1 . In addition, its CV curves barely deviated at all bending angles, manifesting the outstanding mechanical stability and great potential for practical application.
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JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 9
·1-11
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IF 2.132
Lin Jiaxin,Mei Qianwen,Duan Yingchun,Yu Chenhong,Ding Yaping,Li Li
The sensitive determination of VB 2 has broad analytical applications. In this work, a novel VB 2 electrochemical sensor based on the hydrothermal method was constructed to uniformly grow molybdenum disulfide and silver nanoparticles on the surface of electrospun carbon fiber. MoS 2 -Ag-CNF was characterized by scanning electron microscope, EDS spectrum, TEM analysis, cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. The sensor exhibited a high sensitivity of 0.05 to 40 μΜ with a fast response time and a low detection limit of 0.02 μM. The electrode also showed outstanding selectivity toward various interferences. These results indicate that the MoS 2 -Ag-CNF nanocomposites may be promising electrode materials for electrochemical biosensing.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Jianhui Liu,Peipei Chen,Fangquan Xia,Zhen Liu,Hanbiao Liu,Jiangle Yi,Changli Zhou
A "signal on" aptasensor was fabricated for chlorpyrifos detection by a highly efficient electrochemiluminescence resonance energy transfer (ECL-RET) strategy between MoS 2 /CdS nanospheres and silver/carbon quantum dots (Ag/CQDs). Compared with the conventional MoS 2 /CdS nanosheets, the MoS 2 /CdS nanospheres have a larger specific surface area and electron density, which makes the catalytic effect on K 2 S 2 O 8 stronger and has higher luminescence intensity. As a receptor, through the synergistic effect of Ag NPs and CQDs, it has a very wide absorption band between 300 and 600 nm. The absorption band and the emission spectrum of MoS 2 /CdS completely overlap, and the high quantum yield of Ag/CQDs can achieve efficient energy resonance transfer. The proposed ECL aptasensor provided a linear range from 10 nM to 1.0 fM for chlorpyrifos detection and the detection limit of 0.35 fM (S/N = 3) under optimal experimental conditions. The method was successfully applied to the detection of chlorpyrifos in fruit and vegetable samples with satisfactory results.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Weicheng Xu,Shufeng Lai,Suresh C. Pillai,Wei Chu,Yun Hu,Xueding Jiang,Mingli Fu,Xiaolian Wu,Fuhua Li,Hailong Wang
Ag/g-C 3 N 4 plasmonic photocatalysts with porous structure (Ag/PCN) were successfully synthesized via a thermal exfoliation strategy and photo-reduction method. Owing to the combined merits of porous structure and surface plasmon resonance effect of silver nanoparticles, the Ag/PCN catalysts exhibited excellent photocatalytic performance for the degradation of antibiotic agents. With the optimal Ag loading, the Ag/PCN-2 catalyst exhibited the optimal catalytic activity for TC degradation under visible light, which shows about 11.8 times enhancement in the photocatalytic removal efficiency as compared to pure g-C 3 N 4 , respectively. This phenomenon can be attributed to the increased specific surface area, broadened visible light absorption and improved charge separation. The radical quenching results confirmed that h + and O 2 − radicals were the major active species during removal of TC. The degradation of TC is increased with the increment of Ag/PCN-2 catalysts, and the optimum catalyst was found to be 1.67 g/L. The hindering effect of selected of anions (Cl − , CO 3 − , H 2 PO 4 − ) was found to follow the order H 2 PO 4 − > CO 3 − > Cl − . Ag/PCN-2 sample also possessed high stability after six cycles of reuses. Furthermore, the possible degradation pathways of TC and photocatalytic mechanism over Ag/PCN-2 were proposed in detail.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hao Lin,Jie Yang,Yong-feng Liu,Fan-ju Zeng,Xiao-Sheng Tang,Zhi-qiang Yao,Hong-ling Guan,Qian Xiong,Jia-er Zhou,Dao-fu Wu,Juan Du
As a promising energy-saving technique, the eco-friendly and low-cost solid-state white light-emitting diodes (WLEDs) based on quantum dots (QDs) have been widely studied. Herein, a WLED device prepared by core–shell structure nanocomposites based on Ag-In-S/ZnS@SiO 2 quantum dots (AIS@SiO 2 ) and carbon quantum dots (CDs) was successfully constructed. CDs were combined onto the surface of AIS@SiO 2 QDs to synthesize Ag-In-S/ZnS@SiO 2 -Carbon quantum dots (AIS-CDs) nanocomposites with a white-light emission, which successfully overcome the quenching effect of CDs induced by conventional aggregation. The as-prepared AIS-CDs nanocomposites presented high stability and a photoluminescence quantum yield (PLQY) of 35%. Moreover, the corresponding AIS-CDs nanocomposites-based WLEDs demonstrated the color coordinate of (0.32, 0.33), which is comparable to the pure white light (0.33, 0.33); furthermore, the luminous efficiency of the as-prepared WLEDs showed 15.1 lm W −1 . These results reported herein may open up a new avenue for the development of high-performance, low-cost, and environmentally-friendly WLEDs.
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