SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Zhiqiang Zhou,Jianfang Cen,Naijia Jiang,Yu Sun,Zhouyang Li,Liyun Yang
With the widespread application of Ag + in modern life and industry, the potential hazardous effects of Ag + to environment and humans have attracted great concerns. Thus, effective and rapid strategies for Ag + detection are highly desirable. In this paper, a novel ratiometric fluorescence sensor using CdSe quantum dots (QDs) has been constructed for sensitive and selective detection of Ag + , which is based on the formation of Ag 2 Se QDs. CdSe QDs were initially prepared and showed single wavelength emission at 510 nm. When Ag + exists, a rising peak appeared at 650 nm and the emission at 510 nm declined, exhibiting distinct ratiometric fluorescence emission ( I 650 / I 510 ) characteristic with a linear response over the Ag + concentration range of 0.01–4 μM. Significantly, the fluorescence changed from green to red. The detection limit of the constructed sensor is 1.4 nM. Furthermore, the sensing assay can be successfully applied to detect Ag + in real water samples and living cells.
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RSC Advances
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2022
·Vol. 12
·期 55
·36012-36017
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IF 4.036
Ya Di,Jiyao Zheng,Yunwang Zhao,Zikai Yang,Changshun Xie,Jiahan Yu,Yue Zheng,Liming Gao
In this work, a novel strategy of colorimetric and photothermal dual-mode sensing determination of ascorbic acid (AA) based on a Ag+/3,3′,5,5′-tetramethylbenzidine (TMB) system was developed. In this sensing system, Ag+ could oxidize TMB with a distinct color change from colorless to blue color, strong absorbance at 652 nm and a photothermal effect under 808 nm laser irradiation due to the formation of oxidized TMB (oxTMB). When AA was present, oxTMB was reduced accompanied by a change from blue to colorless, and a decrease in absorption peak intensity and the photothermal effect. AA concentration showed a negative linear correlation with the value of both the absorbance intensity at 652 nm and temperature in the range of 0.2–10 μM (A = −0.03C + 0.343 (R2, 0.9887; LOD, 50 nM); ΔT = −0.57C + 8.453 (R2, 0.997; LOD, 7.8 nM)). Based on this, a sensing approach for detection of AA was proposed with dual-mode and without the complicated synthesis of nanomaterials. The photothermal effect and colorimetric signal provided a dual-mode detection strategy for AA, overcoming the limitations of any single mode. This colorimetric and photothermal dual-mode detection has great potential in the detection of AA in clinical pharmaceuticals and the construction of portable and highly sensitive sensors.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Hui Guo,Xiaohui Ren,Xinyue Song,Xin Li
In this work, we fabricated a 300 nm-sized silver-coated silica (SiO 2 @Ag) SERS substrate. Based on SiO 2 @Ag, we designed SiO 2 @Ag@molecular imprinted polymers (SiO 2 @Ag@MIPs) to realize selectively detection of amoxicillin by coating a molecular imprinted layer averagely thinner than 10 nm on SiO 2 @Ag. The as-prepared SERS-active substrate demonstrates excellent enhancement for amoxicillin as well as the enhancement factors were 1.63 × 10 6 of SiO 2 @Ag@MIPs and 2.97 × 10 5 of SiO 2 @Ag, respectively. The SiO 2 @Ag@MIPs core–shell hybrids as SERS substrates and the minimum detectable concentration of amoxicillin was as low as 2.7 × 10 -9 M, and the detection limit of SiO 2 @Ag was 2.7 × 10 -7 M. The linear relationship between intensities of characteristic peaks and concentrations of amoxicillin was established. Both SiO 2 @Ag and SiO 2 @Ag@MIPs substrates were highly sensitive and could achieve qualitative and semi-quantitative analysis of amoxicillin in aqueous media with good linear correlations. Based on the above, SiO 2 @Ag@MIPs will be conducive to detecting actual samples and expanding the practical application.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yong Zhao,Yixuan Xia,Juerui Zhang,Hongde Liu,Yinhui Yi,Gangbing Zhu
In this work, based on the unique self-adsorption and reduction capacities of Ti 3 C 2 T x MXenes toward silver ion, silver nanoparticles (Ag NPs) as reference probe are synthesized and immobilized on the surface of Ti 3 C 2 T x nanoribbons (Ti 3 C 2 T x R) to form Ag-Ti 3 C 2 T x R nanohybrid with a simple stirring-method, and carbon nanotubes (CNTs) are introduced to conjugate Ag-Ti 3 C 2 T x R for inhibiting their aggregation and improving further the sensing performance. Via selecting paracetamol (PA) as a model analyte, a ratiometric voltammetric sensing strategy is proposed by using Ag-Ti 3 C 2 T x R/CNTs as electrode materials on the basic of the collaborative advantages of Ag NPs, Ti 3 C 2 T x R and CNTs: in the absence of PA, Ag-Ti 3 C 2 T x R/CNTs modified electrode displays only an electrochemical signal from the oxidation of Ag 0 ; while in the presence of PA, a varied signal of PA along with its concentration can be observed coupled with a quite stable oxidation signal of Ag 0 . Based on this principle, a highly sensitive and reliable ratiometric sensing platform is designed for PA detection by recording the ratio of signals between PA and Ag 0 . It’s expected that this work exploits a new research field in electrochemical sensors by combining the synthetic advantages of MXenes and metal elements.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Yaya Fang,Weiwei Lu,Peng Xu,Kaisheng Yao,Jun Zhang,Xuefeng Wei,Shuge Peng,Kunpeng Sun
In this work, we propose a plasmon-mediated method to activate oxygen for oxidizing benzyl alcohols to aldehydes. First, hollow Ag@Pd core–shell nanoparticles were prepared and characterized and afterward explored for selective oxidation of benzyl alcohols under visible light illumination. Then, electron paramagnetic resonance analysis and spectroscopic measurements suggested that the main active species responsible for the selective oxidation was 1O2, which was subsequently proved to be generated from the transformation of superoxide radicals •O2–. The light illumination and the presence of a Pd shell were the prerequisites for the successful generation of •O2– and 1O2. Furthermore, the wavelength-dependent performance of Ag@Pd verified the plasmon-mediated nature of these core–shell-type nanocatalysts. Finally, a plausible mechanism of plasmonic activation of oxygen and selective oxidation of benzyl alcohols on Ag@Pd was proposed. Our research opens a green and sustainable way to activate molecular O2 into 1O2 for selective oxidation.
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WASTE MANAGEMENT
·
2022
·
IF 8.816
Yan Li,Guangyu Chen,Wenxin Liu,Chentong zhang,Liuqing Huang,Xuetao Luo
Owing to the rapid advancement of the photovoltaic industry, a lot of photovoltaic (PV) silicon waste will be generated. Thus, the recycling and reuse of waste silicon have become particularly important, both for environmental remediation and economic benefits. In this work, a special structure of porous Si nanoparticles embedded nano-Ag and coated carbon layer (P-SiNPs/Ag@C) was produced by silver-assisted chemical etching (Ag-ACE) the deposited silicon waste. The special porous structure and carbon layer coating can effectively address the volume expansion issues during charge/discharge. The intercalated Ag nanoparticles greatly reduced the transfer impedance and enhanced the electrical conductivity of the anode material. As a result, the novel-designed P-SiNPs/Ag@C anode can maintain a prominent reversible capacity (1521 mAh·g −1 at 0.2 A g −1 after 50 cycles) and outstanding rate performance (1099 mAh·g −1 at 2 A g −1 ). When the current density at 1 A g −1 , the specific capacity still maintains at 706 mAh·g −1 over 300 cycles. The superiority of the prepared P-SiNPs/Ag@C structures was further confirmed by Comsol Multiphysics software. Impressively, the synthesis route provides a novel avenue for value-added utilization of residual silicon waste resources from EB refining silicon and the preparation of high-performance lithium battery silicon-based anode.
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MOLECULES
·
2023
·Vol. 28
·期 24
·8063
·
IF 4.6
Chunyong Zhang,Haoyu Wang,Li Shu,Zhe Li,Jirong Bai,Yinpin Wen,Lin Zhu,Yin Geng,Hengfei Qin
PEDOT-Ag/AgCl is a highly promising material with dual functions of hydrogen evolution reaction (HER) and supercapacitors. In this study, a simple low-temperature stirring and light irradiation method was used to synthesize PEDOT-Ag/AgCl on the surface. Then, PEDOT-Ag/AgCl was analyzed using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. PEDOT-Ag/AgCl reacted in 1 M KOH alkaline electrolyte with an overpotential of 157 mV at 20 mA·cm−2and a Tafel slope of 66.95 mv·dec−1. Owing to the synergistic effect of PEDOT and Ag/AgCl, this material had a small resistance (1.7 Ω) and a large specific capacitance (978 F·g−1at current density of 0.5 A·g−1). The synthesis method can prepare nanostructured PEDOT with uniformly-distributed Ag nanoparticles and rod-shaped AgCl on the surface, which can be used as both HER electrocatalysts and supercapacitor electrodes.
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Analytical Methods
·
2023
·Vol. 15
·期 37
·4851-4861
·
IF 3.1
Rui Yang,Baowen Zhang,Ya Wang,Yi Zheng,Qian Zhang,Xiupei Yang
Substrate materials with high sensitivity and storage stability are crucial for the practical analytical application of surface-enhanced Raman scattering (SERS) techniques. In this work, a SERS-active substrate (Si/Au@Ag/ZIF-67) was fabricated with a metal–organic framework (ZIF-67) on a plasmonic surface (Si/Au@Ag) via self-assembly. The as-prepared material combined the properties of the abundant hotspots of the Au@Ag nanoparticles and the excellent adsorption performance of ZIF-67 for organic molecules. The synergy leads to high sensitivity of the composite substrate with a low detection limit for 4-aminothiophenol (a typical Raman reporter molecule) down to 2.0 × 10−9 M and the analytical enhancement factor (AEF) of the SERS substrate is 3.4 × 106. Moreover, the substrates exhibited good repeatability, high reproducibility, and reliable stability due to the MOF coating. The SERS signal was stable after 60 days of storage at room temperature. Ultimately, the optimal Si/Au@Ag/ZIF-67 was applied as a SERS sensor to analyze thiram, and the results showed a linear concentration range from 10−7 to 10−5 M with good linearity (R2 = 0.9934). The recoveries of thiram in spiked apple juice were in the range of 95.7–102.3%, with relative standard deviations less than 4.3%. These results predict that the proposed SERS substrates may hold great potential for the detection of environmental and food pollution in practical applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Tao Yu,Ruqiu Ding,Fan Quan,Zhiyuan Ni,Xuanwen Liu,Yan He,Wenning Mu,Xuefei Lei,Yuhan Mo
The development of high activity catalysts with excellent durability is a great challenge to realize the industrialization of electrolytic water oxygen evolution. In this work, Ag nanoparticles modified cross column nickel-iron hydroxyl oxide system (NiFeAg) nanocomposites were synthesized by a two-step strategy. Through XPS spectrum, Tafel slope, and EIS electrochemical impedance spectroscopy, it was found that Ag mainly plays a conductive role, accelerates charge transfer, and adjusts the surface electronic structure, to improve the activity of the catalyst. Impressive is the overall hydrolysis performance, with a current density of 10 mA cm −2 achieved at an overpotential of 211 mV, which shows better performance than other catalysts reported in the literature. Finally, through the theoretical calculation of the determination steps of adsorption energy and rate of oxygen-containing intermediates, it is determined that the active center of the catalyst is mainly Ni site. According to the theory of D-band center, Ag can effectively adjust the D-band center, thereby adjusting the adsorption strength of Ni sites on the surface of NiFe catalyst to adsorbent, and finally improving the OER performance of the catalyst.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 9
·1-10
·
IF 5.7
Sun Lei,Guo Hao,Liu Bingqing,Pan Zhilan,Wu Ning,Zhang Hao,Yang Wu
Abstract A novel electrochemical biosensor with excellent performance was fabricated for levofloxacin (LEV) detection, which adopted triangular Ag nanoplates (Tri-AgNP) confined in a poly-L-cysteine (poly-L-Cys) film and a semiconducting covalent organic framework (COF) as the electrochemical sensing material. The developed electrochemical sensor revealed excellent analytical properties because of its good electrical conductivity, fast electron transfer, and abundant bioactive site. Based on this, a linear relationship between the LEV concentration and the peak current response at 0.92 V was obtained under the optimal experimental conditions by differential pulse voltammetry (DPV), with a wide linear range of 0.05 to 600 μM and a low limit of detection (LOD) of 0.0061 μM. The prepared sensor also realized sensitive and accurate determination of LEV in human serum and urine samples by standard addition method, with satisfactory recoveries (97.1 to 104%) and a low relative standard deviation of less than 4.6%. These results indicated that the novel ternary system has a promising application in the development of electrochemical signal probe and electrochemical biosensing platform. Graphical Abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Hao Du,Ningyi Li,Lingxuan Yang,Qiang Li,Guoxiang Yang,Qi Wang
Environmental crisis caused by Cr(VI) pollution has gained remarkable attention. Developing efficient photocatalysts for Cr(VI) remediation remains a great challenge. Herein, the Ag@Ag 3 VO 4 /Ag 3 PMo 12 O 40 (Ag@Ag 3 VO 4 /AgPMo) S-scheme heterojunctions were prepared via the combination of hydrothermal and photodeposition methods for Cr(VI) reduction. The resultant S-scheme heterojunctions were characterized to investigate their morphological, structural, photoelectrochemical and optical properties. The synergy of surface plasmon resonance (SPR) effect of Ag and S-scheme hetero-structure improved their photo(electro)chemical performance. Upon visible light irradiation, the optimized Ag@Ag 3 VO 4 /AgPMo delivered superior photoreduction efficiency (94.8%) of Cr(VI) and stability with a slight loss of the performance (92.8% after 6 cycles). The enhancement of Cr(VI) reduction performance may be ascribed to the extended light absorption range and separation and migration pathway of photo-induced electron-hole pairs confirmed by the proposed photoreduction mechanism. This work not only confirms a highly active catalytic system for the light-driven environmental application, but pave a way for the construction of S-scheme heterojunction photocatalysts.
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TALANTA
·
2022
·
IF 6.556
Panwang Hu,Changkun Xia,Bangxiang Liu,Rulin Feng,Mengzhu Wang,Hengjia Zhu,Xiangheng Niu
Given the huge threat of Hg 2+ to human health, it is always significant to develop Hg 2+ monitoring tools. Utilizing its impacts on nanozyme catalysis is a promising strategy to realize Hg 2+ detection. However, nearly all the assays fabricated based on the principle should be performed in solution and in laboratory and require bulky signal reading instruments, hindering their wider applications. It is highly desired to develop portable, efficient, and practical Hg 2+ sensors. Herein, we proposed the in situ controllable growth of Ag nanoparticles (AgNPs) on paper to fabricate a smartphone optical nanosensor for highly sensitive Hg 2+ detection based on enzyme-mimetic activity stimulation. The ultrasmall AgNPs were directly grown on paper wafers to obtain test strips, which further integrated a 3D-printed holder and an APP built-in smartphone to fabricate the sample-to-answer sensor. The AgNPs-based test strips exhibited a target-stimulated peroxidase-like activity to catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine, and the chromogenic information was captured and processed by the smartphone to rapidly report the level of Hg 2+ . With the portable nanosensor, highly sensitive and specific detection of Hg 2+ was achieved, with a detection limit down to 0.44 nM. The sensor gathers the features of easy construction, simple operation, excellent capability, and robust performance together, promising great potential for rapid on-site analysis.
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