APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 2
·1-10
·
IF 1.784
Chai Chen,Liu Jianxin,Wang Yawen,Zhang Xiaochao,Duan Donghong,Fan Caimei,Wang Yunfang
A h-WO 3 decorated Ag–AgCl composite was prepared through facile precipitation and photoreduction methods and demonstrated to be a highly efficient and stable photocatalyst for the degradation of Rhodamine B (RhB) under visible light. Ag–AgCl/h-WO 3 exhibited much improved photocatalytic performance was elucidated from the physical–chemical properties of AgCl and h-WO 3 and the surface plasmon resonance effect of the Ag particles. The techniques of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectrometry (XPS) and photocurrent were used to characterize crystalline phases, morphology, composition and separation efficiency between electrons (e − ) and holes (h + ) of the synthesized composite photocatalyst. XPS results confirmed the existence of W 5+ and W 6+ on the surface of h-WO 3 sample, which favored electrons transfer between AgCl and Ag, and generated superoxide radical for the degradation of RhB. The active species trapping experiments results further demonstrated that the formation of superoxide radical during the system. Finally, the underlying photocatalytic mechanism for the removal of RhB by Ag–AgCl/h-WO 3 composite was examined.
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INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Wei Guo,Hui He,Hongxiang Zhu,Xudong Hou,Xingjuan Chen,Shile Zhou,Shuangfei Wang,Lingtao Huang,Jiehan Lin
A biomass cellulose-based colorimetric sensor for Ag + and Cu 2+ was prepared by grafting 2,5-dithiourea (DTu) onto biomass-pulp cellulose. The as-prepared sensor (cellulose-DTu) showed excellent selectivity and sensitivity towards Cu 2+ over other common metal ions (Pb 2+ , Mn 2+ , Mg 2+ , Zn 2+ , Hg 2+ , K + , Al 3+ , Ca 2+ , Na + , Cd 2+ , Ni 2+ , Ba 2+ , and Li + ), exhibiting a color change from white to light grey. However, the sensor exhibited a remarkable color change from white to yellow-red upon the addition of Ag + . The naked-eye-detection concentration limits for Ag + and Cu 2+ were 10 −3 and 10 -4 mol/L, respectively. Furthermore, cellulose-DTu responded to both Ag + and Cu 2+ within 5 s. A mechanism for the selective identification of Ag + and Cu 2+ by cellulose-DTu was proposed based on 13 C solid NMR, XPS, and TEM analyses. In addition, the application of cellulose-DTu in real water confirmed that it exhibits the advantages of simplicity, rapidity, and high selectivity for in-situ identification of Ag + and Cu 2+ .
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xian Wei,Shiliang Mei,Guilin Zhang,Danlu Su,Fengxian Xie,Wanlu Zhang,Ruiqian Guo
Transition metal ions doping has been an effective method to optimize the optical properties of quantum dots (QDs) and attracted much interest in recent years. In this work, Cu doped InP/ZnS (Cu:InP/ZnS) QDs have been synthesized via a nucleation-doping method and exhibit dual emission which consists of the intrinsic emission and the dopant emission. With the incremental Cu concentration from 0% to 10%, the dopant emission could be largely tuned from 598 to 707 nm. After introducing Ag ions into Cu:InP/ZnS QDs, the photoluminance (PL) intensity of dual emission gets remarkably enhanced with a PL quantum yield (QY) of 79%, while the emission peak positions change marginally. Through X-ray photoelectron spectroscopy, steady-state and time-resolved PL spectroscopy measurement, it can be concluded that the dopant emission color is mainly dominated by Cu while Ag is conducive to improve the dual emission of Cu and Ag co-doped InP/ZnS QDs. These results would contribute to further understanding dopant-dependent interaction and render this new class of single-phased and dual-emissive QDs a promising future to be applied in white LED.
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AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 72
·期 3
·200-205
·
IF 1.059
Jianhua Ge,Yuchong Chen,Jing Xu,Yujie Liu,Long Zhang,Fugeng Zha
The plasmonic photocatalyst Ag@AgCl was successfully prepared through a facile solvothermal method via a deep eutectic solvent (DES), which is composed of choline chloride and urea. X-Ray diffraction, scanning electron microscopy, energy-dispersive X-ray, element-mapping, X-ray photoelectron spectroscopy, N2 absorption–desorption, and UV-vis diffuse reflectance techniques were adopted to analyse the performance of the plasmonic photocatalyst. Characterisation results indicated that the DES not only served as a solvent and Cl source, but also as a reductant. Meanwhile, the probable mechanism for the formation of Ag@AgCl is discussed, which revealed a visible light enhanced photocatalytic property for the degradation of benzidine. Furthermore, the photocatalyst showed no decrease in its catalytic activity even after five cycles of operation. Finally, a possible photocatalytic oxidation mechanism of Ag@AgCl is proposed.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yong Zuo,Jinjun Chen,Haocheng Yang,Miao Zhang,Yanfen Wang,Gang He,Zhaoqi Sun
In this paper, highly ordered titanium dioxide nanorod (TNR) arrays decorated with Ag-Ag 2 S quantum-dots (QDs) were synthesized on FTO substrate through hydrothermal treatment and in-situ vulcanization . The content of Ag 2 S QDs on Ag/TNR was controlled by changing the immersion time of Ag/TNR in the N-N-dimethyl formamide (DMF) solution containing dissolved sulfur element. The morphology, structure, composition and optical, photoelectric and photocatalytic properties of QDs/TNR arrays were studied in detail. In the visible range, the QDs/TNR array with a soaking time of 12 h exhibits the maximal photocurrent density (0.082 mA/cm 2 ) and photodegradation rate (62.2%), which is 5.5 and 1.85 times higher than that of pure TNR. The improvement of these properties could be attributed to synergy effect between Ag and Ag 2 S materials. That is, Ag QDs can stably capture and transmit photo-generated electrons from the TNR surface, whereas the Ag 2 S promoter is regarded as the interface active sites to enhance photocatalytic reactions. Therefore, the synergistic effect of Ag-Ag 2 S can significantly enhance the photoelectrochemical and photocatalytic properties of the TNR arrays.
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Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Ziyu Chen,Guixia Liu,Xidong Zhang,Jingting Sui,Xiangting Dong,Wensheng Yu,Chao Song
Well-dispersed Ag nanowires and PVP-modified BaGdF 5 : Yb 3+ , Er 3+ spherical nanoparticles were prepared by simple solvothermal and hydrothermal method, and they were further combined to obtain photo-thermal-magnetic multifunctional Ag/BaGdF 5 : Yb 3+ , Er 3+ nanocomposites. Under NIR laser irradiation, monodispersed rare-earth fluoride BaGdF 5 : Yb 3+ , Er 3+ in nanocomposite exhibit good upconversion fluorescent. Meanwhile, under the action of an external magnetic field, the nanocomposite also exhibits good magnetic properties and excellent contrast efficiency by CT/MR imaging. The NCs possess good structure and photothermal stability at multiple cycles due to that Ag nanowires are modified by polyvinyl pyrrolidone and sodium citrate. The biocompatibility and low toxicity of NCs are also remarkable. Importantly, the unique linear morphology of Ag particles can achieve high efficiency conversion between light and heat. Furthermore, in vitro tests also confirm the high efficiency of photothermal therapy for cancer cells.
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PubMed
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 27
·275604
·
IF 3.399
Penghui Li,Wanling Chen,Danni Liu,Hao Huang,Kun Dan,Xiangna Hu,Shaozhou Yu,Paul K Chu,Xue-Feng Yu
We report template growth and dense packing of noble metallic nanoparticles (NPs) on few-layer phosphorene for sensitive surface-enhanced Raman scattering (SERS) detection. Phosphorene obtained by electrochemical exfoliation serves as both the template and reductant in the fabrication of noble metallic NPs which are dispersed on phosphorene without aggregation or pile-up. The BP/Ag/Au and BP/Au/Ag nanocomposites with a nanogap structure exhibit excellent SERS sensitivity and reproducibility with respect to Rhodamine 6G. The BP/Au/Ag nanocomposite is further utilized as the SERS substrate for the detection of two fungicides, thiabendazole and thiram, and detection limits of 10–7 and 10–8 M are achieved. Template growth of Au/Ag nanocomposites is demonstrated to be a green strategy for the fabrication of SERS substrates and has large potential in applications such as pesticide detection.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Xiaofeng Dai,Wen Xu,Teng Zhang,Hongbin Shi,Tao Wang
The monodisperse Cu-Ag core-shell nanoparticles (Cu@Ag NPs) for electric conductive inks were successfully prepared by a simple two-step process consisting of thermal decomposition and galvanic displacement. It was found that 20 mol.% coverage of Ag enabled Cu@Ag NPs oxidation resisting with air. A new approach to achieve coalescence and sintering of Cu@Ag NPs at room temperature was proposed. 1-amino-2-propanol (MIPA), hydrophilic amine with a short C-chain, was first applied to replace the strong stabilizer, the strong stabilizer oleylamine (OAM) adsorbed on particles, thereby obtained preliminary agglomeration and hydrophobic -to- hydrophilic transition to improve the wetting capability of electrolyte solution on the surface of metal film. Then, the reducing electrolyte NaBH 4 solution was used as the destabilizing agent to deeply coalesce particles, and also inhibit the electrochemical corrosion. It takes only a few minutes to achieve sintering in air at room temperature. Due to the effective sintering at room temperature, the conductive patterns could be formed on thermo-sensitive substrates. The eventual resistivity was found to be as low as 36.3 μΩ·cm.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Qinglong Zeng,Xiaofeng Xie,Xiao Wang,Yan Wang,Guanhong Lu,David Y.H. Pui,Jing Sun
The ever increasing problem of air pollution has provoked the research and development of highly-efficient photocatalysts. Herein, Ag nanowires@TiO 2 composite photocatalyst with improved photocatalytic performance was fabricated by a facile one-step solvothermal procedure. The formation of one-dimensional Ag nanowires@TiO 2 core-shell nanostructures could not only broaden the light-absorbing range of TiO 2 catalysts through the surface plasmon resonance effect of Ag nanowires , but also enable the effective separation of photoinduced electron-hole pairs. Under the irradiation of a 260 W fluorescent lamp, the composite with 0.5 wt% Ag nanowires exhibited the highest photocatalytic activity in short contact time (4.8 min), and the corresponding gaseous acetaldehyde removal ratio was 72%, which was much higher than that of bare TiO 2 (37%). The photocatalyst also showed ultrastable activity in the 15 weeks usage, which ensured their practical applications in the air purification field. An in-depth mechanism of the photodecomposition of acetaldehyde was proposed on the basis of the electron spin resonance (ESR) tests and the scavenger experiments. O 2 − reactive radicals was found to play a predominant role in the oxidation and decomposition of acetaldehyde. The outstanding performance of the composite materials and the thoroughly understanding of the reaction mechanism would cast light on the purposively design and optimization of TiO 2 -based catalysts.
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Polymers
·
2018
·Vol. 10
·期 6
·586
·
IF 2.935
Xizi Chen,Fei Liang,Wenzhong Lu,Zheng Jin,Yifei Zhao,Ming Fu
In this paper, nanocomposites that contain core-shell Ag/TiO2particles as the filler and polytetrafluoroethylene (PTFE) as the matrix were investigated. Two surfactants, namely octyl phosphonic acid (OPA) and pentafluorobenzyl phosphonic acid (PFBPA), were applied to modify Ag/TiO2fillers for uniform dispersion in the matrix. Fourier transform infrared spectroscopy analysis of bonds between the TiO2shells and the phosphonic modifiers shows Ti–O–P chemical bonding between the Ag/TiO2fillers and the modifiers. Thermogravimetric analysis results show a superior adsorption effect of PFBPA over OPA on the Ag/TiO2filler surface at the same weight percentage. For nanocomposites that contain modified Ag/TiO2nanoparticles, the loss was reduced despite the high permittivity at the same loading. The permittivity of the nanocomposites by PFBPA is larger than that of OPA, because the more uniform dispersion of inorganic particles in the PTFE matrix enhances the interfacial polarization effect. The mechanism of enhanced dielectric performance was studied and discussed.Keywords:core–shell structure;interfacial modification;dielectric properties;nanocomposites
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APPLIED ENERGY
·
2018
·
IF 7.9
Yafei Zhao,Weixiao Kong,Zunlong Jin,Ye Fu,Wencai Wang,Yatao Zhang,Jindun Liu,Bing Zhang
With the rapid depletion of fossil fuels and the associated environmental issues, solar energy is identified as one of the most promising pollution-free and renewable resource. Herein, we prepared a novel Ag-Paraffin@Halloysite microsphere with the integrated abilities of storing solar energy and catalytic function by self-assembly method. The results show that Ag-Paraffin@Halloysite microsphere has a core-shell structure with paraffin as core and halloysite as shell, and Ag nanoparticles are dispersed uniformly on the surface of the microspheres. The high thermal storage capability, encapsulation ratio and encapsulation efficiency of Ag-Paraffin@Halloysite indicate that it can be used as an ideal heat storage material. Compared with pure paraffin, Ag-Paraffin@Halloysite has higher thermal conductivity, excellent thermal storage capacity, and faster transient thermal response. After heat storage, Ag-Paraffin@Halloysite shows much better catalytic activity (95.3% of conversion in 6 min) compared with the one without heat storage (71.1% of conversion in 6 min) for catalytic reduction of 4-nitrophenol. This result suggests its potential to be used as a self-heating catalyst for storing/releasing thermal energy during catalytic reactions. This work may offer a general and innovative approach to couple phase change materials with catalyst and open up a new avenue for utilization of solar energy in the fields of chemistry and chemical engineering.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Shen-wei Bai,Hui Mei,Lai-fei Cheng
In this article, we report an ultra-thin shell of MoS 2 (3–7 nm) deposited on Ag nanowires (AgNWs) to form a core-shell hybrid system by the sol-gol method. Since AgNWs is easy to be oxidized, a protection shell is necessary. Compared with commonly used hydrothermal method for MoS 2 , it could produce a more thinner and homogeneous shell with the least 3 nm thickness of MoS 2 shell, which is a breaking-through of making MoS 2 shell based on noble nanoparticles . Results show that the obtained hybrid system has great value on surface-enhanced Raman spectroscopy (SERS) due to surface plasmon resonance (SPR) effect of Ag nanowires. Ultra-thin MoS 2 shell was suitable for protecting AgNWs and simultaneously had excellent SERS signature, and this effect was rare for MoS 2 shells. By decreasing the thickness of MoS 2 film from 7 to 3 nm, the intensity of SERS signal could be enhanced. It was observed that the microstructure of this AgNWs@MoS 2 system consist of crystal AgNWs surrounded by crystal MoS 2 . AgNWs@MoS 2 showed excellent SERS effect with Rhodamine 6G (R6G) and N719 dyes, the detection limit could reach to 10 −5 M. Finally for comparison, local electromagnetic field enhancement of AgNWs@SiO 2 was also simulated to indicate AgNWs@MoS 2 better.
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