TALANTA
·
2024
·
IF 5.6
Xue Zhang,Yunsheng Shang,Qi Xie,Xingzhe Hu,Ke Wu,Lu-Lu Qu,Yingqiu Gu
Developing a Surface-enhanced Raman spectroscopy (SERS) method with excellent detecting ability, good recyclability and analyzing multiple pollutants rapidly are critical for evaluation of water quality in emergency pollution affairs. While constructing a multifunctional substrate with these characteristics to realize the application of SERS in water quality monitoring remains a challenge. In this work, a reusable Au@R–Fe 3 O 4 /g-C 3 N 4 SERS substrate is prepared by loading Au nanoparticles (Au NPs) on Fe 3 O 4 nanorings (R–Fe 3 O 4 ) and the formed Au@R–Fe 3 O 4 is further combined with g-C 3 N 4 nanosheets through a simple electrostatic assembly method. The Au@R–Fe 3 O 4 /g-C 3 N 4 nanocomposite presents multifunction of magnetic enrichment, SERS signal enhancement, multiple pollutants analyzing, and photocatalytic activity , which achieves quantitative detection of rhodamine B (RhB), tetracycline hydrochloride (TC), and 4-chlorophenol (4-CP), with detection limits of 5.30 × 10 −9 , 7.50 × 10 −8 , 7.69 × 10 −8 mol/L, respectively. Furthermore, the recyclable detection capability of Au@R–Fe 3 O 4 /g-C 3 N 4 for multi components is demonstrated by the strong SERS signal after 9 cycles of “detection-degradation” processes. Combined with good uniformity and stability, this SERS method based on Au@R–Fe 3 O 4 /g-C 3 N 4 substrate provides a new strategy for the multi-pollutants detection and degradation in water environment.
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ACS Applied Energy Materials
·
2024
·
IF 5.4
Tianxing Wu,Hanqi Meng
Electrocatalytic nitrate ion (NO3–) reduction reaction (NO3RR) offers a sustainable and promising economic process to ammonia (NH3) synthesis, yet the biggest problem is the lack of efficient catalysts. This work designed and prepared dispersed Au nanocrystals on carbon felt (CF) (Au@CF) through a vapor-phase hydrothermal (VPH) method, which can efficiently catalyze the reduction reaction from NO3– to NH3 (NO3RR-to-NH3) under ambient conditions, achieving a maximal NH3 yield rate of 418.15 μg h–1 mgcat.–1 at −0.20 V (vs RHE) with a Faradaic efficiency of 81.06%, while negligible activity decay was found after ten consecutive cycle test. The NO3RR performance of Au@CF exceeds that of the bare CF substrate and pure bulk gold sheet. The VPH approach realized the in situ growth of catalysts on the substrate. This work emphasizes the importance of substrate-loaded dispersed metal catalysts for nitrate removal and NH3 synthesis.
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TALANTA
·
2024
·
IF 5.6
Anni Cui,Jialu Zhang,Zhifei Liu,Xin Mu,Xiahua Zhong,Haitao Xu,Guiye Shan
Epinephrine (EP) is a crucial neurotransmitter in the central nervous system. However, an abnormal level of EP in biological fluids can lead to various diseases. Therefore, it is essential to rapidly and accurately detect EP content. Herein, electrically stimulated patterned Au@Ag nanoarrays with laccase-mimicking activity were designed for the dual-mode detection of EP concentration. The patterned Au@Ag nanoarrays exhibit excellent electrochemical properties and electrically stimulated laccase-mimicking activity. They provide sensitive electrochemical responses for detecting EP content. Simultaneously, the Au@Ag nanoarrays can catalyze the oxidation of EP, enabling its detection through a colorimetric process. This dual-mode approach achieves the detection of EP content over a wide linear range of 0.5–200 μM, with a low detection limit of 0.152 μM. Furthermore, the utility of these nanoarrays for sensing EP in human serum was evaluated. This work provides a convenient method using patterned nanozyme array for the visible, rapid and accurate detection of EP content. It provides the important implication for the development of portable and reliable on-site analytical instruments.
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Nano Energy
·
2022
·
IF 19.069
Xue Liu,Shaojie Jing,Chaogang Ban,Kaiwen Wang,Yajie Feng,Cong Wang,Junjie Ding,Bin Zhang,Kai Zhou,Liyong Gan,Xiaoyuan Zhou
Noble metal decoration is one of the most efficient strategies to boost the performance for water oxidation . However, identifying the role of noble metals and especially the active sites remain a persistent challenge. Here, we report a direct synthesis of Au nanoparticles (NPs) decorated NiFe oxyhydroxides via in-situ electrochemical conversion and a comprehensive study of the activity boost via a combination of systematic experimental and theoretical studies. We found that Fe doping greatly improved the electrical conductivity and the Fe sites were the dominant active centers, collectively responsible for the remarkably enhanced performance in NiFe oxyhydroxide. Upon Au NPs decoration, the content of high-valence Fe/Ni ions was substantially reduced and the formation of surface oxygen vacancy was greatly suppressed. As a result, the dominant active centers transfer to the interfacial Au sites that directly participate in catalyzing water oxidation. Our study presents a fundamental insight into the origin of activity enhancement and especially the active centers in noble metal decorated NiFe oxyhydroxide catalysts.
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ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Zhou Yang,Lingling Dai,Fangfei Liu,Kun Jia,Zhiyuan Ren,Yanmei Yang,Qingmeng Zhang,Weifeng Li,Ming Chen
Background Folate is an essential nutrient, but its bioavailability varies greatly depending on the molecular form present in food. The intake of forms that are not readily absorbed by the human body may lead to insufficient folate levels, particularly during pregnancy, thereby increasing the risk of birth defects. As a result, it is essential to develop a highly sensitive and accurate method capable of distinguishing between the two most common natural folates, 5-methyltetrahydrofolate (5-MTHF) and 5-formyltetrahydrofolate (5-FTHF), to ensure proper folate intake and health outcomes. Results In this study, a photochemical method was employed to load gold nanoparticles (Au NPs) onto carbon nanotubes (CNTs), successfully synthesizing CNTs@Au NPs nanocomposites that exhibit excellent thermal stability and robust surface-enhanced Raman scattering (SERS) activity. These nanocomposites, capable of maintaining structural integrity at temperatures as high as 400 °C, serve as highly effective substrates for in situ high-temperature SERS detection. Using this reliable high-temperature-assisted SERS approach, the structural changes of both folates at elevated temperatures were effectively monitored, enabling clear molecular fingerprinting and distinct differentiation between the two natural folates. Moreover, the CNTs@Au NPs demonstrate exceptional sensitivity, achieving a detection limit as low as 10 -8 M for both 5-MTHF and 5-FTHF, enabling accurate quantification of mixed folate samples and demonstrating reliable performance in real sample analysis. Significance The CNTs@Au NPs with in situ high-temperature SERS capabilities show great potential for various analytical applications. In particular, they provide an effective method for monitoring the quality of folate in dietary supplements and fortified foods, thus contributing significantly to the safety and quality assurance of folate products in the market.
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IEEE SENSORS JOURNAL
·
2019
·Vol. 19
·期 14
·5413-5420
·
IF 3.076
Ya-Kun Lv,Bo-Han Yao,Zhi-Qiang Liu,Shuang Liang,Qing-Chao Liu,Kaihua Zhai,Zhong-Jun Li,Hong-Chang Yao
Functionalization of metal-oxide semiconductors by noble metal nanoparticles is one of the most efficient methods for enhancing the gas-sensing property of semiconducting sensors. Herein, we synthesized a series of Au-loaded hierarchical WO3 hollow microspheres (Au-WO3) via a facile modified solvothermal method combining with wet impregnation method. The structure, elemental composition, and morphology of the synthesized materials were characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, and transmission electron microscopy. The results show that the materials are uniform and independent WO3 hollow microspheres, and Au nanoparticles are well distributed on the surface of WO3. The gas sensing properties of Au-WO3 materials were investigated and the results suggest that Au loading could greatly improve gas sensing performance of WO3 to aromatic compounds, especially toluene and xylene. Among the samples with different Au loading content, the one with 1.5 wt% Au (G3) exhibits the highest responses toward toluene and xylene at 340 °C. Moreover, the G3 sensor presents good responses, short response/recovery time, excellent selectivity, good reproducibility, and long-term stability to toluene and xylene. Excellent gas sensing properties of Au-WO3 material make it a good candidate for detecting toluene and xylene.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 83
·期 2
·467-477
·
IF 1.575
Fu Likang,Zhang Libo,Wang Shixing,Zhang Gengwei,Peng Jinhui
A new adsorbent was synthesized via functionalizing nano-silica with 4-(aminomethyl) pyridine for selective recovery of gold. The adsorbent was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and transmission electron microscopy, and BET (surface area and porosimetry analyzer). The results indicated that the maximum adsorption capacity of Au(III) was 55.5 mg/g at pH 4.0 and room temperature. The adsorption reaction was fairly rapid and reached equilibrium within 30 min. The adsorption processes of Au(III) were fitted well to the Langmuir isotherm model and adsorption kinetics of Au(III) followed the pseudo-second-order rate equation. The adsorption mechanism lies on the chelation and ion exchange between gold ions and amines/hydroxyl groups. The adsorbent had good reusability after five cycles. Moreover, 4-(aminomethyl) pyridine-Silica nanoparticles has a good selectivity in the adsorption of Au(III) from the coexisting ions. Therefore, 4-(aminomethyl) pyridine functionalized nano-silica could be of great potential as new adsorbent for the selective recovery of Au(III) from industrial effluents and waste e-products. Graphical
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ChemCatChem
·
2019
·Vol. 11
·期 8
·2126-2130
·
IF 4.495
Fan Liao,Binbin Jiang,Wen Shen,Ying Chen,Yanqing Li,Yuwei Shen,Kui Yin,Mingwang Shao
Reducing the size and increasing the dispersity of the noble metals are effective ways to decrease the dosage and simultaneously increase their electrocatalytic activities for hydrogen evolution reaction (HER). The Ir−Au bimetallic nanoparticle modified silicon nanowires (Ir−Au−Si) with ultralow content of Ir are prepared and served to catalyze HER in the acid condition. The small Ir−Au nanoparticles are in-situ grown and uniformly dispersed on the surface of silicon nanowires. Ir−Au−Si exhibits a significantly increased activity in HER catalysis compared with Ir−Si and Pt−Au−Si. Ir provides the active sites for HER, Au increases the electron transfer rate, and the silicon nanowires improve the speed of the hydrogen gas evolution. The optimal Ir−Au−Si-2 shows a low Tafel slope of 24 mV dec −1 and high mass activity, which are better than those of Ir−Si and Pt−Au−Si catalysts. Graphical They're all in this together : Ir provides the active sites, Au increases the electron transfer rate, and the silicon nanowires improve the speed of the hydrogen gas evolution. The synergy of Ir, Au and silicon nanowires make Ir−Au−Si an excellent catalyst for hydrogen evolution reaction.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 32
·44759-44769
·
IF 0
Wu Rui,Song Xi,Tian Guanghui
Highly active Fe 3 O 4 /GO/Au composite nanomaterial was fabricated as a substrate of surface-enhanced Raman spectroscopy (SERS) and applied for pesticide residue detection. The three-layer multifunctional Fe 3 O 4 /GO/Au nanoparticles (NPs) were designed by facile method, with high hotspots, and were characterized by various techniques, including ultraviolet spectrophotometry (UV), X-ray diffraction (XRD), infrared absorption spectrometer (IR), and transmission electron microscopy (TEM). The performance of Fe 3 O 4 /GO/Au was evaluated by Raman spectroscopy with R6G as a probe molecule to verify its enhancement effect. It exhibited a strong Raman signal with 10 −6 M of R6G. Furthermore, the presence of Fe 3 O 4 /GO/Au nanohybrid enabled the SERS-based method to detect mancozeb and showed an excellent linear relationship in the range of 0.25–25 ppm, with a low limit of detection (0.077 ppm), satisfactory EF, stability, and repeatability. In addition, the mechanism of SERS enhancement with electromagnetic mechanism (EM) and chemical mechanism (CM) was discussed in detail. Therefore, the proposed SERS approach holds promise as an auxiliary technique for screening contaminated agricultural products, environmental sample, and food in the future.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Leibing Chen,Kairui Li,Jing Li,Xinwei Du,Haisheng Wei
The development of highly dispersed supported noble-metal catalysts is crucial for maximizing atomic utilization and enhancing catalytic performance. This work demonstrates a highly efficient Au–Pt bimetallic catalyst supported on 2-methylimidazole-modified ZnO (N-ZnO) for the chemoselective hydrogenation of nitroarenes. The modification creates strong anchoring sites for metal precursors, which, as confirmed by DFT calculations, effectively suppress metal aggregation and yield highly dispersed nanoparticles with an average size of 2.9 nm. The resulting Au–Pt/N-ZnO catalyst exhibits exceptional performance in the hydrogenation of p-chloronitrobenzene under mild conditions (50 °C and 0.5 MPa H2), achieving >99% conversion and 98.6% selectivity to p-chloroaniline, significantly outperforming its monometallic counterparts due to the synergistic effect. The catalyst also exhibited excellent recyclability and broad substrate applicability for various substituted nitroarenes. This work provides an effective strategy for fabricating highly efficient supported bimetallic catalysts through the organic ligand-mediated surface modification of metal oxide supports.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
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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ACS Applied Electronic Materials
·
2026
·
IF 4.7
Mingzhi Jiao,Liangsong Duan,Jiade Zhang,Wei Peng,Chenyu Wen
To address the demands for efficient detection of combustible gas, such as hydrogen (H2), ethylene (C2H4), and acetylene (C2H2), in complex gas environments relevant to environmental monitoring, industrial safety, and smart homes, we developed zinc oxide (ZnO) gas sensors featuring bimetallic surface decoration with palladium (Pd) and gold (Au). Electron microscopy reveals the surface morphology of the sensing film and Pd/Au codecoration conformation, while X-ray photoelectron spectroscopy supports that codecoration modulates the distribution of surface oxygen species on ZnO. Gas sensing measurements demonstrate that Pd/Au decoration enhances both sensitivity and selectivity toward H2, C2H4, and C2H2. Specifically, a sensor decorated with 0.6 nm Pd and 2.3 nm Au exhibits a 178-fold increase in response to 160 ppm H2. Furthermore, by combining particle swarm optimization algorithm for feature selection with a support vector machine classifier, a recognition accuracy of 96.07% is achieved across seven different pure and mixture gas samples. This study presents a high-accuracy ZnO-based gas sensing platform optimized through both material engineering and machine learning algorithm, providing a reliable solution for real-world applications in industrial safety and environmental monitoring.
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