SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Tao Xu,Rongyan Wang,Chenjie Gu,Tao Jiang
Surface-enhanced Raman scattering (SERS) technology enables to satisfy the increasing demand of clinical drug monitoring due to the superiority of fingerprint recognition, real-time response, and nondestructive collection. Here, a novel graphitic carbon nitride (g-C 3 N 4 )/ molybdenum disulfide (MoS 2 )/Ag composite substrate with a 3D surface structure was successfully developed for the recyclable detection of gefitinib in serum. Attributed to the uniform and dense “hotspots” on the shrubby active surfaces in conjunction with the potential synergistic chemical enhancement of g-C 3 N 4 /MoS 2 heterosystem, a remarkable SERS sensitivity with an attractive enhancement factor value of 3.3 × 10 7 was demonstrated. Meanwhile, a type-II heterojunction between g-C 3 N 4 and MoS 2 enabled more efficient diffusion of photogenerated e − -h + pairs assisted by the localized surface plasmon resonance of Ag NPs, which contributed to the reliable recyclable detection of gefitinib. The ultra-low limit of detection at 10 −5 mg/mL and high recycling rates of gefitinib beyond 90% in serum were successfully realized. The results demonstrated the as-prepared SERS substrate has tremendous potential to be untilized for in-situ drug diagnostics.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Ye Jiang,Xiaochan Wang,Guo Zhao,Yinyan Shi,Yao Wu
Antibiotic residues in aquaculture environments disrupt the ecosystem balance and pose a potential hazard to human health when entering the food chain. Therefore, ultra-sensitive detection of antibiotics is necessary. In this study, a multifunctional Fe 3 O 4 @mTiO 2 @Ag core–shell nanoparticle (NP), synthesized using a layer-by-layer method, was demonstrated to be useful as an enhanced substrate for in-situ surface-enhanced Raman spectroscopy (SERS) detection of various quinolone antibiotics in aqueous environments. The results showed that the minimum detectable concentrations of the six investigated antibiotics were 1 × 10 −9 mol/L (ciprofloxacin, danofloxacin, enoxacin, enrofloxacin, and norfloxacin) and 1 × 10 −8 mol/L (difloxacin hydrochloride) under the enrichment and enhancement of Fe 3 O 4 @mTiO 2 @Ag NPs. Additionally, there was a good quantitative relationship between the antibiotics concentrations and SERS peak intensities within a certain detection range. The results of the spiked assay of actual aquaculture water samples showed that the recoveries of the six antibiotics ranged from 82.9% to 113.5%, with relative standard deviations ranging from 1.71% to 7.24%. In addition, Fe 3 O 4 @mTiO 2 @Ag NPs achieved satisfactory results in assisting the photocatalytic degradation of antibiotics in aqueous environments. This provides a multifunctional solution for low concentration detection and efficient degradation of antibiotics in aquaculture water.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xiaojian Li,Lijun Li,Yangzhi Wang,Xuehui Hao,Changzheng Wang,Zhenshan Yang,Hefu Li
The large-area fabrication of flexible and transparent surface-enhanced Raman scattering (SERS) substrates with high performance by a facile and efficient method is still challenging. Here, we demonstrated a large-scale, flexible and transparent SERS substrate composed of PDMS nanoripple array film decorated with silver nanoparticles (Ag NPs@PDMS-NR array film) prepared by a combination of plasma treatment and magnetron sputtering. The performances of SERS substrates were characterized by rhodamine 6G (R6G) using a handheld Raman spectrometer. The optimal Ag NPs@PDMS-NR array film exhibited high SERS sensitivity, with a detection limitation of R6G reaching 8.20 × 10 −8 M as well as excellent uniformity (RSD = 6.8%) and batch-to-batch reproducibility (RSD = 2.3%). In addition, the substrate showed outstanding mechanical stability and good SERS enhancement by backside illumination, thus it was suitable for in situ SERS detection on curved surfaces. The detection limit of malachite green on apple and tomato peels was 1.19 × 10 −7 and 1.16 × 10 −7 M, respectively, and quantitative analysis of pesticide residues could be realized. These results demonstrate that the Ag NPs@PDMS-NR array film has great practical potential in rapid in situ detection of pollutants.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhi-Min Ma,Bing-Tao Wang,Ke-Ying Cui,Ye Wan,Su-Juan Li
In this paper, a new Ag nanoparticles (AgNPs)/graphene nanocomposites with polydopamine (PDA) as coupling agent was electrochemically synthesized and has been used as electrode modifications for the electrochemical detection of H 2 O 2 . The structural characterizations clearly showed that small sized and highly dispersed AgNPs were electrodeposited on reduced graphene oxide (RGO) with the help of PDA agent. The obtained AgNPs/PDA/RGO nanocomposites exhibited higher electrocatalytic activities toward reduction of H 2 O 2 compared with the AgNPs/RGO composites without involvement of PDA. The AgNPs/PDA/RGO nanocomposites presented excellent electrochemical sensing performance for detection of H 2 O 2 with wide linear concentration range, high detection sensitivity, good selectivity and excellent reprodutibility and stability. The successful application of AgNPs/PDA/RGO nanocomposites in human serum samples for the detection of H 2 O 2 was also demonstrated.
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Membranes
·
2023
·Vol. 13
·期 5
·530
·
IF 4.2
Lixin Xie,Yaqian Liu,Shichang Xu,Wen Zhang
The surface modification of reverse osmosis (RO) membranes to improve their anti-biofouling properties is gaining increased attention. Here, we modified the polyamide brackish water reverse osmosis (BWRO) membrane via the biomimetic co-deposition of catechol (CA)/tetraethylenepentamine (TEPA) and in situ growth of Ag nanoparticles. Ag ions were reduced into Ag nanoparticles (AgNPs) without extraneous reducing agents. The hydrophilic property of the membrane was improved, and the zeta potential was also increased after the deposition of poly (catechol/polyamine) and AgNPs. Compared with the original RO membrane, the optimized PCPA3-Ag10 membrane showed a slight reduction in water flux, and the salt rejection declined, but enhanced anti-adhesion and anti-bacterial activities were observed. TheFDRtof the PCPA3-Ag10 membranes during the filtration of BSA, SA and DTAB solution were 5.63 ± 0.09%, 18.34 ± 0.33% and 34.12 ± 0.15%, respectively, much better than those of the original membrane. Moreover, the PCPA3-Ag10 membrane exhibited a 100% reduction in the number of viable bacteria (B. subtilis and E. coli) inoculated on the membrane. The stability of the AgNPs was also high enough, and these results verify the effectiveness of poly (catechol/polyamine) and the AgNP-based modification strategy for the control of fouling.Keywords:RO membrane;anti-fouling;co-deposition;poly (catechol/polyamine);silver nanoparticles
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Flexible and Printed Electronics
·
2023
·Vol. 8
·期 2
·025021
·
IF 3.1
Lipeng Huang,Xiaolian Chen,Xinzhou Wu,Zishou Hu,Shuhong Nie,Chenchao Huang,Shuo Zhang,Wenya Xu,Fangfang Pei,Wenming Su,Zheng Cui
Flexible electrochromic technology has gained numerous attentions in flexible smart wearable devices and flexible displays. For large-area flexible electrochromic devices (FECDs), highly conductive transparent electrodes with advanced stability at a prolonged redox cycling process are indispensable. In this work, a silver (Ag)/nickel (Ni) mesh/PH 1000 hybrid transparent film were successfully fabricated by selectively electrodepositing an 800 nm-thick dense metallic Ni layer and coating PH 1000 on an embedded Ag mesh to improve its electrochemical stability. The prepared hybrid transparent film presented high conductivity with a sheet resistance of below 1.5 Ω sq−1 at over 80% optical transmittance. The Ag/Ni mesh/PH 1000 was successfully utilized as current collectors for all-solid-state FECDs, showing fast coloration switching with a bleaching/coloring time of 0.7 s/0.9 s. In addition, the device demonstrated an exceptional electrochemical cycling stability, which could sustain 89% of its initial optical modulation after 25 000 cycles. More importantly, a remarkable mechanical durability was also achieved with a small optical modulation decay of 15% and an invariable response time after 1000 rolling cycles. In addition, uniform coloration were realized on a 6 × 6 cm2 FECD, demonstrating its great potential for applications of next-generation up-scaling FECDs.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jiuhong Yi,Zexiang Wang,Jing Hu,Ting Yu,Yidan Wang,Pengfei Ge,Yunlei Xianyu
Antioxidants are crucial for human health, and the detection of antioxidants can provide valuable information for disease diagnosis and health management. In this work, we report a plasmonic sensing approach for the determination of antioxidants based on their antietching capacity toward plasmonic nanoparticles. The Ag shell of core–shell Au@Ag nanostars can be etched by chloroauric acid (HAuCl4), whereas antioxidants can interact with HAuCl4, which prevents the surface etching of Au@Ag nanostars. We modulate the thickness of the Ag shell and morphology of the nanostructures, showing that the core–shell nanostars with the smallest thickness of Ag shell have the best etching sensitivity. Owing to the extraordinary surface plasmon resonance (SPR) property of Au@Ag nanostars, the antietching effect of antioxidants can induce a significant change in both the SPR spectrum and the color of solution, facilitating both the quantitative detection and naked-eye readout. This antietching strategy enables the determination of antioxidants such as cystine and gallic acid with a linear range of 0.1–10 μM. The core–shell Au@Ag nanostars are further immobilized in agarose gels to fabricate test strips, which can display different color changes in the presence of HAuCl4 from 0 to 1000 μM. The agarose-based test strip is also capable of detecting antioxidants in real samples, which allows naked-eye readout and quantitative detection by a smartphone.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 3
·505-513
·
IF 1.6
Wang Wenbo,Xiong Wenhao,Long Yuting,Li Hong
We demonstrated a chemical process in the fabrication of a SERS fiber probe with an ultrahigh sensitivity. The synthesis was carried out by preparing Au@Ag core-shell nanorods (Au@Ag-NRs) self-assembled on polyelectrolyte (PE) multilayers, for which Au@Ag-NRs were controlled by adjusting the silver layer thickness. The effect of silver layer thickness of Au@Ag-NRs on the SERS performance of the fiber probe was investigated. The SERS fiber probe shows the best performance when the silver layer thickness is controlled at 8.57 nm. Under the condition of optimizing silver layer thickness, the fiber probe exhibits ultra-high sensitivity ( i e , 10 −10 M crystalline violet, CV), good reproducibility ( i e , RSD of 3.5%) and stability. Besides, electromagnetic field distribution of the SERS fiber probe was also investigated. The strongest enhancement is found within the core of fiber, whereas a weakened electromagnetic field exists in the fiber cladding layer. The SERS fiber probe can be a good candidate in ultra-trace detection for biomedical and environmental areas.
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Scientific Reports
·
2023
·Vol. 13
·期 1
·1-12
·
IF 4.6
Song Jie,Wan Yating,Yang Chen,Deng Qiuju,Cui Yingde,Yan Zhihong,Liu Yi
In this paper, a novel composite is constructed as a non-enzymatic hydrogen peroxide (H 2 O 2 ) sensor by liquid-phase exfoliation method, which is composed of copper oxide, cuprous oxide and silver nanoparticles doped few-layer-graphene (Cu x O/Ag@FLG). Its surface morphology and composition were characterized by scanning electron microscopy (SEM) and X-ray photo spectroscopy (XPS), and its H 2 O 2 sensing performances include catalytic reduction and quantitative detection were studied with electrochemical methods. Our sensor had a high sensitivity of 174.5 μA mM −1 cm −2 (R 2 = 0.9978) in an extremely wide range of concentrations from 10 μM to 100 mM, a fast response (about 5 s) and a low limit of detection (S/N = 3) of 2.13 μM. The sensor exhibits outstanding selectivity in the presence of various biological interference, such as dopamine, ascorbic acid, uric acid, citric acid, etc. In addition, the constructed sensor continued 95% current responsiveness after 1 month of storage further points to its long-term stability. Last but not least, it has a good recovery rate (90.12–102.00%) in milk sold on the open market, indicating that it has broad application possibilities in the food industry and biological medicine.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 19
·13474-13486
·
IF 3.3
Xin Guan,Xiao-li Wang,Xue-wen Zhu,Hui Yu,Ming Yang,Xiang-ting Dong,Ying Yang,Long Xia
β-Bi2O3 demonstrates excellent photocatalytic activity under visible light, but it has a very high photogenerated e−–h+ recombination rate and quite low quantum efficiency. AgBr also shows excellent catalytic activity but Ag+ is easily reduced to Ag under light radiation, which limits its application in the photocatalysis field, and there are few reports about the application of AgBr in photocatalysis. In this study, the spherical flower-like porous β-Bi2O3 matrix was first obtained, and then the spherical-like AgBr was embedded between the petals of the flower-like structure to avoid direct light radiation. The only light through the pores on the β-Bi2O3 petals could be transmitted onto the surfaces of AgBr particles to form a nanometer point light source, which photo-reduced Ag+ on the surface of the AgBr nanospheres to construct the Ag-modified AgBr/β-Bi2O3 embedded composite and a typical Z-scheme heterojunction was constructed. Under this bifunctional photocatalyst and visible light, the RhB degradation rate reached 99.85% in 30 min, and the photolysis water hydrogen production rate reached 6.288 mmol g−1 h−1. This work is as an effective method for not only the preparation of the embedded structure, quantum dot modification and flower-like morphology but also for the construction of Z-scheme heterostructures.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Gaojian Lv,Lifang Sun,Hui Gao,Chengcheng Ma,Wen Li,Shougang Chen
The construction of heterojunction has been considered as an effective strategy to achieve charge separation and improve photocatalytic activity. In this work, stable reduced Cu 2 O/Ag/Bi 2 MoO 6 (Cu 2 O/Ag/BMO) nanocomposites with high-efficiency antibacterial activities were synthesized via a simple wet chemical method. After illumination of 30 days, Cu 2 O/Ag/BMO still showed excellent antimicrobial capability against P. aeruginosa and S. aureus . The photoluminescence spectroscopy was used to analyze the electrons and holes recombination efficiency of samples, which suggested Cu 2 O/Ag/BMO could promote electron-hole separation and extend the lifetime of photogenerated carriers. The results of photocurrent responses test suggested that the photocurrent density of Cu 2 O/Ag/BMO was four times stronger than the Cu 2 O, which indicated the higher separation efficiency of electrons and holes pairs for the formed Cu 2 O/Ag/BMO. Besides, density functional theory proved that Ag nanoparticles could promote the electrons transfer from the Bi 2 MoO 6 layer to the Cu 2 O layer which facilitated the separation of photogenerated electron-hole pairs. Therefore, electrons and holes could better participate in the redox reactions and then generate more active substances (•OH and •O 2 – ), improving the antimicrobial ability. Therefore, the prepared Cu 2 O/Ag/BMO composites has a great application prospect in the antifouling field.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2023
·Vol. 70
·期 7
·1481-1492
·
IF 1.8
Jia-Rong Xue,Rong-Chao Xue,Pei-Yao Chen,Yong Wang,Li-Ping Yu
In this study, a hydrostable Z-scheme Ag/CsPbBr 3 /Bi 2 WO 6 photocatalyst was designed and fabricated for the degradation of Rhodamine B (RhB). The structural instability of CsPbX 3 perovskites in water is one of the main obstacles that restrict their practical application in photocatalytic wastewater treatment. The photocatalyst was prepared in three steps: passivation of CsPbBr 3 nanocrystals (NCs) with 3-mercaptopropionic acid (MPA), construction of a heterojunction between MPA-passivated CsPbBr 3 NCs and Bi 2 WO 6 ultrathin nanosheets, and doping Ag nanoparticles as charge mediators in the heterojunction. The as-obtained 5%Ag/20%CsPbBr 3 /Bi 2 WO 6 exhibits good stability and excellent photocatalytic activity. The degradation rate is 93.9% in 120 min, which is 4.41 times than that of Bi 2 WO 6 .
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