Biosensors-Basel
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2022
·Vol. 12
·期 10
·881
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IF 5.743
Pei Dai,Xianzhi Huang,Yaqian Cui,Lihua Zhu
Tetrabromobisphenol A (TBBPA) was one of the most widely used brominated flame retardants. However, it easily contaminates nature and harms the environment and human health during its production and use. Therefore, it is necessary to strictly control the content of TBBPA in electronics. Surface-enhanced Raman spectroscopy has the advantages of being fast and sensitive, but it is difficult to obtain the SERS spectra of TBBPA because the hydrophobic TBBPA molecule is difficult to approach with the hydrophilic surface of common noble metal SERS substrates. In the present work, a hydrophobic Cu-Ag chip was developed for the SERS detection of TBBPA. The integration of the hydrophobic interaction and the Ag-Br bonding promoted the adsorption of TBBPA on the Cu-Ag chip, allowing for SERS detection. It was observed that both the hydrophobicity and bimetallic composition of the Cu-Ag chip played important roles in the SERS detection of TBBPA. Under the optimized conditions, the low limit of detection of the established SERS method for TBBPA was 0.01 mg L−1, within a linear range of 0.1–10 mg L−1. Combined with ultrasonic-assisted extraction, the substrate could be used for the quantitative determination of TBBPA in electronic products. Compared with the HPLC-UV method used as a national standard, the relative error of the SERS method for quantifying the TBBPA content in a mouse cable and shell was ±3% and ±7.7%, respectively. According to the SERS results, the recovery of TBBPA in the spiked mouse shell was 95.6%.Keywords:tetrabromobisphenol A;surface-enhanced Raman scattering;hydrophobic interaction;bi-metal chips;synergistic coupling
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Mao Shen,Wei Li,Fengzao Chen,Lei Chen,Yuxiang Chen,Suqing Chen,Shibin Ren,Deman Han
Bisphenol A (BPA) is a potential endocrine-disrupting compound with adverse effects on both human health and the environment. Therefore, it is urgent to develop a convenient, sensitive and accurate method for BPA detection. In this paper, a ratiometric electrochemical sensor for BPA detection was developed using Ag@Fe 3 O 4 -rGO composite modified glassy carbon electrode (GCE), with the peak oxidation current of silver nanoparticles (NPs) in the material as the reference signal and the peak oxidation current of BPA as the indicator signal. The Ag@Fe 3 O 4 -rGO composite was prepared by a simple one-step solvothermal method. Due to the chemical functionality and two-dimensional structure, the rGO combined with Ag@Fe 3 O 4 core–shell NPs provides an excellent platform for BPA detection. The morphology, structure and electrochemical performance of Ag@Fe 3 O 4 -rGO composite were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy and electrochemical techniques. The proposed ratiometric electrochemical BPA sensor shows the linear detection range of 0.1–10.0 µM (R 2 = 0.997), with detection limit of 0.028 μM (S/N = 3), good selectivity, reproducibility and stability. In addition, this proposed ratiometric electrochemical sensor was successfully verified in the detection of BPA in real water samples.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xiangyu Peng,Jiayi Tian,Shuai Zhang,Wei Xiao,Xiaozhen Tian,Yubin Wang,Juanqin Xue,Dashi Lei
Rational design of photoelectrode with high visible light utilization rate and separation efficiency of electron-hole pairs is the key step in photoelectrocatalytic technology. In this work, Z-Scheme photoelectrocatalyst (ZTO/rGO/Ag/AgBr) was synthesized by hydrothermal and photo-reduction process. Comparing with pure Zn 2 SnO 4 (ZTO), adding reduced graphene oxide (rGO) effectively improved electrons transfer efficiency. Notably, the addition of Ag/AgBr not only broaden the visible light response range of ZTO, but also accelerated the separation of photo-generated electron-hole pairs, and constructed all-solid-state Z-Scheme heterojunction . Meanwhile, DFT calculation showed that Ag metal on rGO surface could act as active site for organic dyes degradation . Moreover, the addition of extra bias potential during photoelectrochemical process not only accelerate the migration of carriers, but also inhibit the recombination of photo-generated electron-hole pairs. Methylene blue (MB) could be effectively removed during photoelectrochemical reaction process, which was attributed to hydroxyl radical (•OH) and superoxide radical (•O 2 - ). In this work, Z-Scheme transfer pathway, assisted photoelectrocatalytic technology, is a feasible strategy for improving catalytic performance.
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Journal of Industrial Textiles
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2022
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IF 2.926
Jing Han,Hai-Tao Ren,Ting-Ting Li,Bing-Chiuan Shiu,Yong-Gui Li,Jia-Horng Lin,Ching-Wen Lou
Visible light response PAN@Ag-Ag2O/Sch (PAN@AS, schwertmannite and polyacrylonitrile abbreviated as Sch and PAN) nanofibers with different mass ratios were synthesized by electrospinning technology and pH-induced precipitation reaction. X-Ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy analysis showed that the formation of Ag-Ag2O/Sch heterojunction and Ag-Ag2O nanoparticles were evenly distributed on the surface of Sch. The prepared nanofibers have high oxidative removal performance for As(III) under visible light. In the PAN@AS0.10 system, the total As removal percent can reach 90.96% after 120 min irradiation at pH 4.0. The scavenger experiments confirmed that the main active substances of the PAN@AS0.10 system were h+ and •OH. The high oxidation and removal performance of the PAN@AS0.10 composite for As(III) was attributed to the effective separation of photogenerated electron-hole pairs and high adsorption capacity of Sch for As under acidic conditions. This research provides a new material for the oxidation and removal of pollutants in water [such as As(III)] and also provides a research basis for the preparation of recyclable photocatalysts.
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Environmental Science-Nano
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2022
·Vol. 9
·期 3
·975-987
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IF 9.473
Ying Liu,Yucai Wan,Chuncai Kong,Pan Cheng,Qin Cheng,Qiongzhen Liu,Ke Liu,Ming Xia,Qihao Guo,Dong Wang
Engineering a highly accessible semiconductor with optimized physicochemical structure for efficient photocatalysis under visible light is never-ending. Herein, a facile route was developed to fabricate a caterpillar-like ZnO–C (ZC) hollow nanocomposite by directly pyrolyzing Zn-BTC MOF microrods and nanorods, which have been previously synthesized via a rapid supersonic-assisted aqueous reaction at room temperature. It is demonstrated that the ZC nanorods radically grow on the surface of the hollow nanocomposite directly converted from MOF-microrods at 550 °C and form a caterpillar-like catalyst based on an oriented attachment mechanism. After in situ photo-reduction of AgNO3, the Ag–ZnO–C (AZC550) nanocomposite catalyst possesses ultrahigh photodegradation turnover frequency (TOF) values towards methyl blue (3.00 × 10−3 mol mol−1 min−1), 4-nitrophenol (0.14 × 10−3 mol mol−1 min−1) and amoxicillin (3.43 × 10−3 mol mol−1 min−1), as well as a photo-inactivation activity of 6.25 × 105 cfu mg−1 min−1 towards E. coli, outperforming most state-of-the-art catalysts reported thus far. The ameliorated photocatalytic performance and recyclability can be assigned to the synergistic effects between the Zn–C hierarchical nanoarchitecture and Ag-NPs. This work provides a new approach for the design of efficient solar photocatalysts.
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ACS Applied Nano Materials
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2022
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IF 6.14
Hua Cheng,Siqi Liu,Ruiqi Wang,Wei Zhang,Rui Pan,Zhe Li,Yi Gong,Fangkuo Wang,Rui Hu,Jianjun Ding,Xian Zhang,Chen Lin,Jianying He,Xingyou Tian
The fabrication of thin composite films incorporating metal-based fillers with a delicate structure to achieve high electromagnetic interference shielding effectiveness (EMI SE) at low metal content remains a great challenge. In this work, benefiting from the excellent electrical conductivity of Ag nanoparticles, Ag nanoparticle-coated polystyrene (PS@Ag) microspheres with a large PS core were selected as electrically conductive fillers, and the volume exclusion effect guaranteed the construction of an electrically conductive network with low silver loading. A spontaneous process to construct a segregated laminar structure with a three-dimensional electrically conductive network happened with the assistance of a gravity-driven effect. The flexible thin films with a low amount of silver exhibited outstanding EMI SE per unit thickness (SE/d). To further investigate the effect of the structure on the EMI SE efficiency, it is found that the alternate interfaces play a critical role in enhancing shielding performance by stacking multiple films compared to the bulk films obtained by casting. The EMI SE for an only 0.3 mm triple-piece stacking film with 6.3 wt % Ag loading could reach 55.3 dB compared to 37.2 dB for the triple-thickness casting film. Using the stacking process results in easy accessibility for tailored composites with the desired EMI SE, which supplies a new strategy for the design of shielding materials in the next-generation electronics.
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Catalysts
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2022
·Vol. 12
·期 5
·479
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IF 4.501
Xiangxiang Li,Shuling Chang,Yanting Wang,Lihong Zhang
The selective and effective conversion of CO2into available chemicals by electrochemical methods was applied as a promising way to mitigate the environment and energy crisis. Metal silver is regarded as an efficient electrocatalyst that can selectively convert CO2into CO at room temperature. In this paper, a series of coral-like porous Ag (CD-Ag) catalysts were fabricated by calcining silver-carbonaceous microsphere (Ag/CM) precursors with different Ag content and the formation mechanism of CD-Ag catalysts was proposed involving the Ag precursor reduction and CM oxidation. In the selective electrocatalytic reduction of CO2to CO, the catalyst 15 CD-Ag showed a stable current density at −6.3 mA/cm2with a Faraday efficiency (FE) of ca. 90% for CO production over 5 h in −0.95 V vs. RHE. The excellent performance of the 15 CD-Ag catalysts is ascribed to the special surface chemical state and the particular nano-coral porous structure with uniformly distributed Ag particles and pore structure, which can enhance the electrochemical active surface areas (ECSA) and provide more active sites and porosity compared with other CD-Ag catalysts and even Ag foil.Keywords:carbon dioxide reduction;silver;carbonaceous microsphere;carbon monoxide;electrochemical
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JOURNAL OF BIOMATERIALS APPLICATIONS
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2022
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IF 2.712
Lumin Li,Xiaofeng Ji,Kai Chen
The rapid development of flexible electronic technology has led to the in-depth study of flexible wearable sensors to achieve accurate sensing under different external stimuli. However, it is still a huge challenge to develop hydrogel-based wearable skin-like sensors with super ductility, high sensitivity, and self-healing properties. Herein, the Ti3C2 type of MXene was synthesized, and the Ag/MXene nanocomplexes were incorporated into polyvinyl alcohol-borax matrix to construct a novel composite hydrogel as the multifunctional nanofillers, which could bring both improved properties and novel functionalities. The Ag/MXene-Poly (vinyl alcohol) (PVA) hydrogel displayed integrated merits of highly strain sensitive (GF = 3.26), self-healing (within 10 min, 91% healing efficiency), and excellent antibacterial activity. The hydrogel could be assembled into a wearable skin-like sensor to monitor human movement, including large deformations (finger, elbow, wrist, and knee bending) and tiny deformations (mouth’s movement and throat vocalization) in real time. Therefore, this work shed a new light on the development of flexible wearable skin-like sensors for the personalized healthcare monitoring, human–machine interfaces, and artificial intelligence.
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ANALYTICA CHIMICA ACTA
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2022
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IF 6.911
Jingjing Li,Zhixue Zhu,Manru Zhang,Qingxin Zhang,Wenyu Sun,Yeru Wang,Long Jiang,Zhiqiang Guo,Yu Wang,Su Liu,Jiadong Huang,Jinghua Yu
Uracil-DNA glycosylase (UDG) is a common glycosylase that can expressly recognize and remove damaged uracil bases, and the ultrasensitive detection of which is significant to maintain genomic stability and early clinical diagnosis of disease. Herein, we proposed a sensitive colorimetric sensing platform to detect UDG. Combined with target-manipulated drawstring DNAzyme and [email protected] nanorods ( [email protected] NRs) indicator, we achieved in naked-eyes observation and ultrasensitive detection of UDG. Briefly, when the UDG exists, the dynamic reaction of rope pulling will occur generating the active conformation of DNAzyme. The cutting effect will be further produced when we add Mg 2+ , thus the generated trigger chain can mediate the occurrence of CHA reaction, followed by generating amount of ·OH which can etch [email protected] NRs causing the shifted of localized surface plasmon resonance (LSPR) peak. By contrast, there is no obvious shift of LSPR peak. This strategy shows extraordinary specificity and sensitivity toward UDG providing a detection limit of 4.6 × 10 −5 U mL −1 . By using of this method, we detected UDG specifically in complex samples, proving that it’s potential applications in biomedical research and clinical diagnosis are fantastic.
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ACS Applied Nano Materials
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2022
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IF 6.14
Cheng Zhang,Congying Shao,Junsheng Wang,Ziwei Li,Mengna Liang,Yongxiang Wang,Dan Liu,Shun Lu
Copper nanoclusters (CuNCs) with bright blue-emitting fluorescence have been synthesized via a simple one-pot process using 2-mercapto-1-methylimidazole (MMI) as a stabilizer. The as-prepared MMI-CuNCs exhibited a high quantum yield of 19.2%, a long luminescence lifetime of 10.57 μs, and excellent photostability. Significantly, the fluorescence intensities of MMI-CuNCs were effectively quenched with addition of Ag+ ions, and the MMI-stabilized CuNCs were developed as a sensitive fluorescent nanoprobe for the label-free determination of silver ions for the first time. The fluorescence sensor provided a fast linear response toward Ag+ in the range of 0.025–50 μM, with a detection limit of 6.7 nM. The fluorescence quenching mechanism was ascribed to an agglomeration-induced effect and static quenching. A fluorescence sensing platform was successfully applied for Ag+ detection in human serum samples with good accuracy and high reproducibility, signifying the practical applicability of the assay. Additionally, MMI-CuNCs displayed good solid-state blue emission and are suitable for security ink applications. The MMI-CuNCs were utilized as a color conversion layer to construct blue- and white-light-emitting diodes (LEDs) with excellent white light properties by a facile combination of MMI-CuNCs and UV LED chips. This result facilitates multiple functions of MMI-CuNCs in the application of label-free sensors, anticounterfeiting, and optical devices.
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Nanoscale
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2022
·Vol. 14
·期 24
·8825-8832
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IF 8.307
Fang Cheng,Wenjie Gu,Han Zhang,Chunyuan Song,Yunfeng Zhu,Feiyue Ge,Kuiming Qu,Hai Xu,Xue-Jun Wu,Lianhui Wang
Controlled synthesis of noble-metal nanoframes is of great interest due to their promising applications in plasmonics and catalysis. However, the synthesis is largely limited to a multiple-step approach involving selective deposition followed by selective etching. Here we report a facile and general strategy to synthesize Au–Ag nanoframes based on a direct galvanic replacement reaction between Ag nanoparticles and a gold(I) complex, sodium aurothiosulfate, without an extra etching process. The formation of Au–Ag nanoframes in our approach undergoes a continuous concaving and hollowing-out process from Ag templates, which is related to selective Au deposition and the Kirkendall effect. As a proof-of-concept, it was shown that Au–Ag nanoframes with different dimensions can be prepared from the corresponding Ag nanocolloids using our strategy. The prepared wire-like Au–Ag nanoframes show superior single-particle surface-enhanced Raman scattering due to the linear narrow nanogaps within the nanoframes. We believe this study signifies a new approach by mediating galvanic replacement to prepare noble-metal nanoframes with precise controllability, which may enable a variety of applications in plasmonics and catalysis.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 15
·23056-23068
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IF 4.672
Yan Ma,Minming Zou,Wenjing Chen,Shikun Xiao,Wenxing Luo,Jiatao Zhou,Yinhui Che,Shuai Zu,Qinglin Li,Xiongxin Jiang,Xiaowu Hu
Summary Recently, the technology of employing phase change materials (PCMs) for solar energy storage has grown more magnetic due to the focus of various latent heat storage investigations to solve the energy crisis. In this work, a novel and eco-friendly shape-stable phase change material based on a biological matrix was prepared through vacuum impregnation, which used porous carbon as a support substrate from Cyperus alternifolius (CA), polyethylene glycol (PEG) as the phase change medium, and silver nanoparticles attached to the matrix as the reinforcement factor. The superior porous structure of CA allows it to have a high loading rate of PEG. The multifunctionality of silver nanoparticles can increase the thermal conductivity of the bio-based shape-stable phase change material (BSPCM) up to 0.676 W/(m K), while also boosting its photo-thermal conversion efficiency to 82.7%. Furthermore, the Ag@BSPCM has an excellent melting enthalpy of 137.3 J/g, as well as outstanding thermal stability and reliability. Additionally, the great photo-to-thermal conversion efficiency of Ag@BSPCM (82.7%) and the significant anti-leakage capability bodes well for its future application. This demonstrates the prepared Ag@BSPCM proves its feasibility for thermal energy storage management and photo-thermal conversion.
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