JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Chengsheng Yang,Lei Liu,Desheng Li,Changming Liu,Juan Wang,Yingkai Liu,Hui Zhang
Two-dimensional transition metal dichalcogenides (TMDCs) hold great promise for optoelectronic devices owing to their unique electronic and optical properties. However, their typically high dark current severely compromises the photodetection performance. To overcome this challenge, we fabricated a type-II band-aligned MoS 2 /WS 2 heterostructures and innovatively incorporated a layer of gold nanoparticles (Au NPs) at its interface. The resulting MoS 2 /Au NPs/WS 2 heterostructures exhibits drastically suppressed dark current while well preserving the photocurrent. Scanning Kelvin probe force microscopy (SKPFM) measurements confirm the type-II band alignment. We demonstrate that in the dark, the Au NPs in contact with MoS 2 create an electron-depletion region in the conduction band, effectively blocking the majority carrier transport and thus reducing the dark current. Under illumination, however, the photo-generated electrons possess sufficient energy to overcome this barrier, leaving the photocurrent largely unaffected. Therefore, under a 5 V bias, compared with the pristine MoS 2 /WS 2 heterostructures, the MoS 2 /Au NPs/WS 2 heterostructures device exhibits a reduction in dark current density by approximately 2.27 × 10 3 times, while the photocurrent density shows only a slight decrease of about 2.19 times. This remarkable contrast leads to a significant enhancement of the light-to-dark current ratio from 4.71 × 10 1 to 5.01 × 10 4 and an expansion of the linear dynamic range from 46.81 dB to 107.58 dB. Furthermore, the suppressed dark current directly translates to a ∼2.27 × 10 3 -fold reduction in standby power consumption under dark conditions. Our work, integrating plasmonic nanoparticles into the interface of a TMDCs heterostructures, provides a novel and effective strategy for engineering high-performance, low-power two-dimensional photodetectors.
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International Journal of Electrochemical Science
·
2023
·Vol. 12
·期 12
·11818-11832
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IF 1.5
Yuli Wei,Huihui An,Wu Yang,Hao Guo
In this work, a simple, sensitive and rapid electrochemical sensor for bisphenol A determination based on a 3D Au NPs-poly-L-glutamate/graphene nanocomposite was proposed and the structures of the nanocomposite were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopic (FTIR) and X-ray diffraction (XRD). The electrochemical behaviors of bisphenol A on the nanocomposite GCE were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). In the potential range of 0.0 ~ 1.0 V, an irreversible oxidation peak appeared on the modified electrode in 0.1 mol L -1 phosphate buffer solution (pH = 6.0). Under the optimum conditions, the anode peak current of bisphenol A increased linearly with the its concentration in the ranges from 0.009 μmol L -1 to 0.1 μmol L -1 and 0.1 μmol L -1 to 1.0 μmol L -1 with the detection limit down to 3×10 −10 mol L -1 (S/N = 3) and the corresponding linear regression equations were Ipa ( μA)= − 0.1129 C ( μmol L -1 ) + 0.5532 (N = 6, R 2 = 0.9057) and Ipa ( μA) = − 0.05970 C ( μmol L -1 ) + 0.02182 (N = 5, R 2 = 0.9950) respectively. The proposed method was successfully used for the determination of bisphenol A content in wastewater and milk samples, and the recoveries were in the range from 98.10% to 104.9%.
研究领域:
分析化学
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环境监测
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食品安全
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电化学传感
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纳米生物技术
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-9
·
IF 5.7
Hao Xuanxuan,Liu Zhimin,Fan Yunfeng,Wang Jie,Cui Chen,Hu Leqian
A novel electrochemiluminescence (ECL) aptasensor, using graphite carbonitride (g-C 3 N 4 ) capped CdS quantum dots (CdS QDs@g-C 3 N 4 ) and Au nanoparticles decorated triethanolamine (AuNPs@TEOA) as dual coreactants, was proposed for the determination of mucin 1 (MUC1). Higher ECL efficiency was acquired due to the double enhancement contribution of CdS QDs and TEOA to Ru (bpy) 3 2+ ECL. Additionally, AuNPs@TEOA also acted as nanocarrier for MUC1 aptamer immobilization. After the aptasensor was incubated in target MUC1, the decreased ECL emission was obtained because of the poor conductivity of MUC1. The ECL aptasensor displayed a good linear correlation for MUC1 in the range 0.1 pg mL −1 -1000 ng mL −1 , and the detection limit was 33 fg mL −1 . MUC1 spiked into human serum samples was quantified to assess the practicability of the ECL aptasensor. Graphical abstract
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 12
·127506
·
IF 3.9
Lingling Han,Yali Yang,Bowen Wang,Fuxin Liu,Na Li,Dongyu Zhang,Xiuhui Liu
It is well known that elevated homocysteine (HcySH) values can lead to a wide range of diseases. Quantifying HcySH can be an aid in early diagnosis and treatment of related illnesses. Consequently, it is very significant to develop a sensitive detection technology for exact monitoring of HcySH. Based on the excellent affinity of Au NPs with the -SH group in HcySH and the excellent conductivity of cMWCNTs, a novel electrochemical sensor (Au NPs/cMWCNTs/GCE) was constructed to detect HcySH in this paper. The sensor not only can effectively improve the specificity of HcySH detection, but also has the wide linear range and low detection limit (2.89 × 10−8 M, S/N = 3). What's more, the homocysteine contents of a variety of serum samples were directly detected by the constructed sensor for the first time, and the recovery rate was satisfactory. In conclusion, the research provided an effective method to achieve the rapid, reliable and ultrasensitive determination of HcySH, which has important applications in biomedical analysis and clinical diagnosis.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Huan-Yu Chen,Xing-Biao Liu,Qi-Xin Guan,Can-Jun Zou,Ping-Ping Fang
The detection of antibiotics has attracted great attention among scientists and health researchers in the past decades. However, it is still difficult to realize the sensitive and selective detection of antibiotics with similar structures. Herein, the antibiotic molecules of oxytetracycline (OTC) can be sensitively and selectively detected by surface-enhanced Raman spectroscopy (SERS) on NH2–UiO-66(Zr)@Au nanoparticles (NPs). The SERS substrate of NH2–UiO-66(Zr)@Au NPs realizes a detection sensitivity of 1 × 10–12 g·L–1 for 4-mercaptobenzoic acid, indicating its high SERS activity. A high detection sensitivity of 10–11 g·L–1 is obtained for OTC on such a SERS substrate. Besides the high sensitivity, NH2–UiO-66(Zr)@Au NPs can also selectively detect OTC from streptomycin sulfate, salicylic acid, and ofloxacin by SERS on NH2–UiO-66(Zr)@Au NPs, with a selective detection limit of 10–10 g·L–1. Furthermore, OTC can be selectively detected in a real sample of river water with a detection limit of 1.0 × 10–10 g·L–1. Therefore, this study provides an effective way to enrich and detect antibiotics in real samples in the environment.
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NANO
·
2020
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IF 1.566
Bin Chen,Jialu Zhang,Yan Zhang,Lijing Zhu,Haichao Zhao
Herein, carbon quantum dots (CQDs) and gold nanoparticles (Au NPs) were synthesized and deposited on the surface of Polysulfone (PSF) membrane using polydopamine as the sublayer, resulting in excellent antibacterial property and photocatalytic activity for degradation of organic dyes. Water contact angle (WCA) of the membrane before and after surface modification dropped from 9 3 . 9 ∘ to 5 8 . 4 ∘ , due to outstanding hydrophilicity of CQDs. The antibacterial test against E . c o l i found that the CQDs/Au NPs were beneficial to improve the antibacterial property of the membrane, and the antibacterial rate could reach 90%, effectively prolonging the service life of the membrane. In addition, the adsorption of bovine serum albumin (BSA) molecules on the membrane was significantly reduced, and the irreversible fouling ratio also decreased from 41.3% to 10.7%. On the other hand, the CQDs/Au NPs layer was used as a photocatalytic material for degradation of methylene blue.
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FOOD CHEMISTRY
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2024
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IF 8.5
Rui Tan,Mei Zeng,Qiuwen Huang,Na Zhou,Mengjiang Deng,Yuanyuan Li,Xiaojun Luo
The presence of nitrite in food products has generated significant public concern. A simple and rapid dual-mode surface-enhanced Raman spectroscopy (SERS)/colorimetric detection of nitrite is proposed based on a diazo reaction and multifunctional gold nanoparticle-doped covalent organic framework (Au@COF) composite. Under acidic conditions, the reaction between toluidine blue and nitrite yielded a colorless diazo salt, simultaneously attenuating its characteristic absorption peak and Raman signal. The multifunctional Au@COF materials enhanced the Raman signal and ensured good reproducibility. Additionally, the reaction rates improved, and the sensitivity was enhanced due to the excellent adsorption capacity of the COF. The proposed method demonstrated high sensitivity and excellent recovery rates for nitrite detection in food samples. This approach shows potential for precisely detecting nitrite content in real-world food samples by integrating the simplicity of colorimetric analysis with the enhanced sensitivity of SERS.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Hanyue Jiang,Juan Lu,Wenzhuo Wang,Pengfei Han,Guangping Ma,Tengying Ma,Li Tian,Jing Wang
In this study, a porous bimetallic oxide Cu 4 RuO 5 with a high specific surface area was prepared via electrospinning followed by high-temperature calcination. This oxide exhibited a significant electrochemiluminescence (ECL) signal when reacting with S 2 O 8 2− . Utilizing this bimetallic oxide as an ECL material, we constructed a simple solid-state ECL sensor, in conjunction with Au NPs@SiO 2 , for the sensitive detection of tilmicosin in milk. The sensor was constructed using a layered modification approach. Initially, the bimetallic oxide Cu 4 RuO 5 was modified onto the electrode surface. Cu 4 RuO 5 not only serves as a luminescent reagent but also promotes electron transfer within the system due to its large specific surface area and porosity, achieving amplification of the first-stage ECL signal. Subsequently, Au NPs@SiO 2 was modified onto the oxide surface. The SiO 2 shell effectively shields the system from complex matrix interferences while providing a large specific surface area for the immobilization of Au NPs. The Au NPs further accelerate electron transfer, thereby achieving amplification of the second-stage signal. Based on this two-step amplification strategy, the constructed ECL sensor exhibits a linear response range for tilmicosin from 1.0 × 10 −13 to 1.0× 10 −6 mol L −1 , yielding a detection limit of 2.01 × 10 −14 mol L −1 (3σ/m). This sensor combines high sensitivity, good selectivity, and excellent stability, providing a novel method for the rapid determination of antibiotic residues in food, successfully implemented to enable rapid determination of tilmicosin in milk matrices.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 8
·087511
·
IF 4.386
Wensi Xu,Xiansen He,Xiaokun Li,Suxiang Feng
In this study, a novel electrochemical sensor was designed to detect luteolin (Lu) with the composite of gold nanoparticles and nickel phthalocyanine-based 2D conductive metal-organic frameworks (Au NPs@NiPc-Cu MOFs) for the first time. The NiPc-Cu MOFs exhibit excellent conductivity, large specific surface area, and porous structure, which can accelerate the mass transfer process of target molecules. To further improve the sensitivity of the sensing platform, Au NPs with outstanding conductivity were introduced to the surface of NiPc-Cu MOFs to prepare Au NPs@NiPc-Cu MOFs. The synergistic effect of NiPc-Cu MOFs and Au NPs endows the sensor with excellent electrocatalytic performance and outstanding sensitivity. Under optimal conditions, the electrochemical sensor has a wide linear range (0.1–40 μM). Moreover, the prepared sensor possesses good stability and anti-interference ability. This method does not require complicated sample pretreatment, simple operation, and short detection time, which can provide a new method for the rapid detection of Lu.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jing Zhang,Ye Yang,Yi-Ping Liu,Guo-Cong Liu,Xi Zhu,Xin-Yu Jiang,Jin-Gang Yu
Electrochemical sensors have been considered as one of the most important methods to determine amino acid (AA) enantiomers. An interesting and highly-efficient electrochemical sensor, gold nanoparticles/D-sorbitol modified glass carbon electrode (Au NPs/D-sorbitol/GCE), was developed for the chiral recognition of Tyrosine (Tyr) enantiomers. Au NPs/D-sorbitol/GCE sensor exhibited excellent chiral recognition efficiency for Tyr enantiomers (I L /I D = 1.99, ∆Ep = 36 mV) by square wave voltammetry (SWV). The possible recognition mechanism was also proposed by cyclic voltammetry (CV) at different scanning rates, wettability measurements, and density-functional theory (DFT) calculations. The smaller steric hindrance and more suitable molecular distance are beneficial to the selective formation of hydrogen bonds between L-Tyr and the chiral interface of the sensor. The energy difference caused by the formation of hydrogen bonds between the chiral interface and Tyr enantiomers can be expressed as different peak currents to achieve chiral recognition. The redox peak current of Tyr enantiomers at Au NPs/D-sorbitol/GCE showed good linear relationship with their concentration, and the limits of detection (LOD) were calculated to be 4.12 μM and 8.07 μM for L-Tyr and D-Tyr, respectively. Importantly, Au NPs/D-sorbitol/GCE can also predict the mass ratios of L-Tyr in the enantiomeric mixtures. In addition, the sensor has shown good anti-interference ability, high stability, and excellent reproducibility.
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FOOD AND AGRICULTURAL IMMUNOLOGY
·
2022
·
IF 3.268
Peizhen Li,Xiuhua Xia,Jiannan Chen,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao,He Qian,Yuliang Cheng
Gold-coated silver core–shell nanoparticles (Ag@Au NPs) have been widely used for SERS analysis due to plasmon resonance performances. However, it is a great challenge to fabricate Ag@Au core–shell structures with specified morphology. In this paper, the size and shape of Ag NPs (core) were precisely controlled by a seed-mediated approach, and then the gold shell was completely coated on under the strong reduction of ascorbic acid, resulting in Ag@Au NPs with highly regulated morphology. The obtained Ag@Au NPs achieved a similar or even better SERS enhancement factor (EF) (up to 5.7 × 107) compared to Ag NPs, but significantly higher stability. For the rapid SERS detection of nitrofurantoin metabolite AHD, a limit of detection (LOD) as low as 1 × 10−10 M and a wide linear range from 1 × 10−4 to 1 × 10−8 M were obtained. Furthermore, recoveries for crayfish samples were from 90.5% to 108%, indicating a good performance of the presented method in real sample detection.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xu Xu,Chaonan Jiao,Hao Yang,Hao Chen,Jing Wang
Au NPs generated in situ by photochemical reduction method were used as catalysts for the oxidation of sodium cholate . The circular dichroism of the oxidation product of sodium cholate exhibits a positive Cotton effect at 335 nm and an intense negative Cotton effect at 281 nm. Electrospray ionization (ESI) mass spectra and nuclear magnetic resonance (NMR) spectra were performed to characterize the chemical composition of the oxidation product of sodium cholate, revealing that two of the hydroxyl groups were selectively oxidized to oxo groups and the oxidation product is 12-hydroxy-3,7-diketo-cholanic acid (3,7-DKCA). The chiral recognition abilities of the aggregates of 3,7-DKCA were investigated by using planar chiral molecules R- and S-binaphthyl compounds. Compared with sodium cholate, the aggregates of 3,7-DKCA displayed higher chiral selective host–guest binding to the model molecules and the chiral recognition mechanism was clarified.
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