FOOD CONTROL
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2024
·
IF 5.6
Xiangyu Song,Huhu Wang,Xuefei Shao,Xiaobo Yu,Xinglian Xu
Salmonella Typhimurium is the prevalent pathogenic bacterium that causes foodborne-related diseases. Here, we developed a surface-enhanced Raman scattering (SERS) biosensor for S . Typhimurium detection. The biosensor was based on Au@Ag core-shell nanorods (Au@Ag NRs) to enhance Raman signal and aptamer-specific identification. 4-mercaptobenzoic acid (4-MBA) and aptamer-modified Au@Ag NRs were used as Raman signal probes. The aptamer adsorbed on the Au@Ag NRs surface when the reaction system was free of bacteria. Once S . Typhimurium was added, the aptamer then specifically identified and captured the cells. The decrease of free aptamers in solution restoring the SERS “hot spot” between the Au@Ag NRs and enhancing the 4-mercaptobenzoic acid (4-MBA) Raman signal. Quantitative analysis of S . Typhimurium was performed using Raman-enhanced spectroscopy. Under optimised conditions, the 4-MBA SERS intensity at 1072 cm −1 was used to determine S . Typhimurium in the range of 10 2 –10 7 CFU mL −1 (y = 1660.84x+2340.7, R 2 = 0.9912). The limit of detection was 64 CFU mL −1 . This method also has high specificity and is not interfered by the other five control bacteria to complete the detection of S . Typhimurium. The developed method is simple, rapid, sensitive and specificity, which can be used to detect actual samples. It can be potentially used for detecting bacteria.
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FUEL
·
2024
·
IF 6.7
Jin Zhang,Mengting Gao,Ruiyi Wang,Xincheng Li,Jie Wang,Shiye Li,Kemeng Cao,Jiao Li,Yunwei Wang,Zhanfeng Zheng
The research on the strong interaction between metal and vacancy has made new progress. Herein, we report the bifunctional role of oxygen vacancies on in situ synthesis of Au nanoparticles photocatalyst and selective hydrogenation of α, β-unsaturated aldehydes. Due to the memory effect of layered double hydroxide (LDH), LDH after high temperature calcination could restore its original layered structure and introduce a large number of oxygen vacancies. In the process of catalyst synthesis, Au 3+ was in situ reduced to Au nanoparticle over LDH with the help of oxygen vacancies with special electronic environment. A 99 % conversion of cinnamaldehyde and 97 % selectivity for cinnamyl alcohol was obtained over Au/LDH-700 in the selective hydrogenation of cinnamaldehyde under visible light irradiation without bases addition. This high performance was attributed to the synergistic effect between the localized surface plasmon resonance (LSPR) effect of Au nanoparticles and the abundant oxygen vacancies in LDH. The Au nanoparticles absorb visible light to induce the dehydrogenation of isopropanol and provide stable hydrogen source for the hydrogenation reaction. The LDH rich in oxygen vacancies selectively adsorbs the –C O group of cinnamaldehyde via the terminal oxygen mode to ensure the formation of highly selective cinnamyl alcohols. In addition, experimental data shows Au/LDH-700 catalyst could hydrogenate a variety of α, β-unsaturated aldehydes and ketones into corresponding unsaturated alcohols with high conversion and selectivity. Our work points out a new direction for the selective hydrogenation of α, β-unsaturated aldehydes to unsaturated alcohols.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Jun He,Xiaoyu Qi,Jingjing Liu,Hao Zhang,Zhongliao Wang,Deliang Li,Shuwang Duo
Triethylamine is a typical volatile toxic gas that can cause respiratory system diseases, blood diseases, and eye lesions upon prolonged inhalation. To mitigate this problem, a highly sensitive triethylamine sensor was achieved by loading the precious metal Au onto hexagonal hollow prisms of In 2 O 3 . Prominently, the microstructure of the hollow hexagonal prisms was derived from Material Institute Lavoisier(MIL)-68(In), which provided a larger specific surface area and more active sites. The sensing test results manifested that the sensor based on 0.6% Au/In 2 O 3 owned the best sensing performance among all samples, especially with the response value of 476.3 ( R a / R g ) towards 100 ppm triethylamine at 200°C, which was 37 times higher than that of pristine In 2 O 3 sensor. Additionally, the stability deviation value was less than 5.6% and the selectivity ( Response triethylamine / Response ethanol ) reached up to 28.8. Such distinguished characteristics can be attributed to the delicate hollow hexagonal prisms structure and the decoration of Au, which accelerated gas molecules transport and enhanced oxygen molecule adsorption and dissociation. This work may open up new visas for morphology manipulation of triethylamine sensing materials and intrinsic mechanism of performance enhancement.
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Nano Energy
·
2024
·
IF 16.8
Qian Han,Zengyi Fang,Rui Lin,Junyang Chen,Xianhao Wei,Cuicui Gong,Zhixin Yang,Pingjin Zou,Jingyuan Zhu,Lili Xing,Xinyu Xue,Jinyi Lang,Yi Zhou,Meihua Chen
Cancer remains a global health concern, necessitating advanced therapeutic strategies to address its fatal challenges. Conventional treatments, such as radiotherapy and chemotherapy, often lack tumor specificity and may induce systemic toxicity. Photodynamic therapy (PDT) and sonodynamic therapy (SDT) have emerged as promising alternatives, demonstrating high specificity and minimal side effects. In this study, we propose a novel piezo-photodynamic therapy (PPDT) enabled with battery-free wireless cancer therapeutic dot, in which the nanocomposites of gold nanoparticles (Au NPs), zinc oxide nanorods (ZnO NRs) and hydrophilic polyethylene glycol (PEG) can enhance reactive oxygen species (ROS) generation and effectively inhibit tumor growth. The therapeutic dot is implanted directly inside the tissue around the tumor and wirelessly controlled by ultrasound (US), allowing dual activation of electron-hole pairs from the nanocomposites via US and ultraviolet light (UV). The internally generated piezoelectric field minimizes electron-hole recombination, maximizing ROS induction within tumor cells. This PPDT approach surpasses the efficacy of conventional PDT and SDT, showcasing a synergistic therapeutic effect. The study further elucidates the detailed mechanism of Au@PEG-ZnO NRs catalysts, providing insights into their piezoelectric-photocatalytic action. The battery-free wireless control and minimally invasive implantation of the therapeutic dot with inorganic piezo-photocatalyst open new perspectives in cancer therapy.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 2
·1-11
·
IF 5.3
Li Xuhuan,Zhu Ling,Yang Rong,Cai Chunli,Yin Changsheng,Shen Xiaodong,Xin Wenbo
A polyethyleneimine (PEI)-assisted simple and efficient one-pot hydrothermal reduction method is reported to prepare high-quality gold nanodendrites (AuNDs) on a carbon nanotube (CNT) sheet. We observed that the prepared AuNDs have a well-defined backbone-multiple branching structure. With the systematical investigation of the growth mechanism, it was found that the bromide (Br − ) ion concentration has an essential effect on the formation of AuNDs. By evaluating the growth conditions of AuNDs, it was demonstrated that PEI attached on the surface of CNT sheet plays multiple crucial roles as a reducing agent, stabilizer, and structure director in the formation of AuNDs. The prepared CNT-AuNDs hybrid was employed as a flexible surface-enhanced Raman scattering (SERS) substrate to detect the analyte Congo red (CR). Due to the unique structure of AuNDs, such as 3-D branches, rough surface, and sharp edges, the analyte can be detected efficiently down to a concentration as low as 1 × 10 −8 M with an enhancement factor as high as 5.6 × 10 7 . Graphical abstract
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Hao-Jia Qin,Shuai Zhao,Hua-Ping Gong,Zhi Yu,Yufeng Wang,De Zhang,Pei Liang
Antibiotic residue detection plays a key role in ensuring human health. However, rapid, reliable, and highly sensitive detection methods are still insufficient. To tackle this challenge, in this study, the Au@Ag/Ce-UIO-66, a nanocomposite material consisting of bimetallic gold core and silver shell (Au@Ag) introduced on the surface of Ce-UIO-66, was successfully synthesized. By meticulously regulating the exact concentration and volume of silver nitrate, we successfully generated an optimal matrix. This significantly enhanced the detection capability of the probe molecule CV to an impressive concentration of 10 −9 M, with a remarkably low relative standard deviation of 7.54 %. The matrix exhibits excellent surface-enhanced Raman scattering (SERS) performance and stability, reaching adsorption equilibrium within 30 min. Moreover, employing this substrate enables the detection of sulfadiazine at concentrations as minimal as 2.5 μg/L, significantly surpassing the standards set by the European Union. Notably, the Raman spectral signal of sulfadiazine maintains stability across various pH conditions at a concentration of 10 −5 M. Finally, the adsorption mechanism and enhancement mechanism between Au@Ag/Ce-UIO-66 and sulfadiazine were explored.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Wenchao Shangguan,Guoqiang Li,Shidi Gui,Xiaodong Zhang,Sugang Meng,Shifu Chen,Yingxuan Li
Separating photoexcited holes in metallic nanostructure to drive H 2 O oxidation reaction to balance the CO 2 photoreduction reaction is highly desirable, but challenging. The bottleneck lies in the sluggish kinetics of both photoexcited hole transfer and H 2 O oxidation. Herein, this work demonstrates that the in situ reconstruction of n -type wide-bandgap AlOOH-supported Au nanoparticle heterogeneous photocatalyst, triggered by thermal and photothermal cooperative effect during photocatalytic reactions, facilitates the efficient CO 2 photoreduction through optimizing the Au 5 d -band holes separation and H 2 O activation. In situ and ex situ characterizations evidence restructuring at interfaces to form an ultrathin γ-Al 2 O 3 nanolayer (≈2 nm thickness), which optimizes the energy band structure and promotes spontaneous transfer of photoexcited Au 5 d -band holes to the valence band of AlOOH, and prolongs the lifetime of electrons available for CO 2 reduction on Au. Furthermore, hydroxyl vacancies generated during restructuring process are demonstrated to promote H 2 O adsorption and lower the energy barrier for O 2 formation, supplying adequate protons for CO 2 protonation reduction and thereby boosting CO 2 photoreduction efficiency. This study offers valuable insights into the underlying mechanisms of utilizing n -type semiconductors to separate photoexcited d -band holes in metal nanoparticles.
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Batteries-Basel
·
2024
·Vol. 10
·期 7
·235
·
IF 4.6
Tian Zhou,Jie Sun,Jigang Li,Shouping Wei,Fan Zhang,Jing Chen
In this study, a flower-like Au/CeO2supported catalyst composite anode was prepared to explore its impact on thermal runaway triggered by overcharging and flame. Through structural and performance characterization, it was found that the catalyst has a high specific surface area and good CO catalytic oxidation capability, with a CO removal rate higher than 99.97% at room temperature. Through electrical performance testing, it was discovered that, compared to batteries without the catalyst, batteries using the composite anode did not exhibit significant capacity degradation. In overcharge testing, the catalyst prolonged the voltage rise time and peak voltage occurrence time of the battery. In thermal runaway testing, the addition of the catalyst delayed the detection time of CO and significantly reduced the concentration of thermal runaway products, especially the peak concentration and integrated concentration of CO, demonstrating its effectiveness in reducing thermal runaway products. Therefore, this study provides a new approach for improving the safety of lithium-ion batteries. The catalyst exhibits good performance in reducing toxic gases generated after thermal runaway and delaying the occurrence of thermal runaway, providing strong support for the safe application of lithium-ion batteries.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Zheng Zhang,Dan Sui,Lingling Yang,Man Xu,Kangjun Wang
Lanthanide-doped upconversion nanoparticles (UCNPs) can achieve multiple emissions and have garnered significant attention in accurate diagnostics over the past few years. Herein, multifunctional core–shell nanoplatforms (UCNP/Au@MnO2 NPs) were developed by combining Au, UCNP and mesoporous MnO2. Under near-infrared (NIR) laser irradiation, the UCNP/Au@MnO2 NPs achieved excellent photothermal conversion and photoluminescence properties. The UCNP/Au@MnO2 NPs have demonstrated exceptional performance in fluorescence quenching and recovery, as MnO2 can serve as both a fluorescence quencher and a GSH recognizer. Moreover, the mesoporous MnO2 shell of the UCNP/Au@MnO2 NPs served as an effective nanocarrier. A comprehensive analysis of drug release kinetics and mechanisms revealed that the UCNP/Au@MnO2 NPs exhibited sensitive GSH- and NIR-responsive drug release behavior. The cumulative drug release reached up to ca. 94.52%, with the release profile being dependent on both GSH concentration and NIR laser irradiation. Thus, the work highlights the potential of UCNP/Au@MnO2 NPs as a versatile platform for applications, such as smart photoluminescence, photothermal conversion, and controlled drug release.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Qi He,Qiuping Yang,Xiangyu Tong,Xiaotong Zhang,Yi Wang,Xiaohu Wu,Yanyun Ma,Yiqun Zheng
Precise spectral modulation of plasmonic absorptions in the near-infrared (NIR-I and NIR-II) regions is crucial for matching laser wavelengths in practical applications, driving significant interest in sensing, photothermal therapy, and bioimaging. In this work, we show that silver (Ag) alloying in gold (Au) nanosheets provides tunable plasmonic absorption across both NIR-I (700–950 nm) and NIR-II (1000–1350 nm) spectral windows while preserving their intrinsic two-dimensional morphology. Through controlled variation of the Ag/Au ratio in a seed-mediated synthesis, we observe a continuous blue-shift of the in-plane dipole plasmon resonance from 1000 nm (NIR-II) to 700 nm (NIR-I). Theoretical simulations confirm that Ag incorporation tunes plasmonic responses by modulating both the free electron density and local dielectric environment. This morphology-preserved alloying approach establishes a versatile platform for developing optically switchable nanomaterials with promising applications in multiplexed biosensing and wavelength-selective photothermal therapy.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xinming Nie,Yuanyuan Liu,Xinting Qian,Yunsheng Shang,Luqing Chen,Xinxin Shi,Mengbao Fan,Lu-Lu Qu
A high-performance aldehyde sensor is of great significance for the detection of construction machinery exhaust gas and the analysis of environmental gas. Herein, we developed a novel aerogel SERS substrate of 4-Aminothiophenol (4-ATP) decorated three-dimensional (3D) porous structure using graphene oxide (GO), Au nanoparticles (Au NPs) and MXene as precursors. Benefiting from the synergistic effect of metal conductivity of MXene, the oxygen-enriched surface of GO and the high-density of “hot spots” (Au NPs), the 3D MXene/Au/GO/4-ATP aerogel structure exhibits enhanced capture efficiency of gaseous aldehyde and plasma enhancement for in-situ aldehyde gas detection. More importantly, a hot-blowing assisted SERS detection device was designed for gaseous aldehydes sensing. The SERS detection device responses to gaseous aldehyde molecules in simulated exhaust gas, offering fast detection time, high sensitivity, excellent reproducibility, and distinct selectivity. This work provides a potential strategy for monitoring harmful emissions, and promotes the design of a multi-functional SERS platform for complex gas sensing.
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Plasmonics
·
2025
·
IF 4.3
Zhang Yirui,Wang Zhiyang,Zhang Ailing,Chang Pengxiang,Li Zhen,Shi Yanmei
In this paper, a fiber-optic biosensor with the structure of both Au film and Au nanoparticles (AuNps) co-modified on D-shaped photonic crystal fiber (PCF) by adhesion with polydopamine (PDA) is proposed and experimentally fabricated, where the electric field near the sensing surface is increased and thus the sensitivity is improved by coupling the surface plasmon resonance (SPR) in Au film with the localized surface plasmon resonance (LSPR) in Au nanoparticles (AuNps), D-shaped PCF as well as high refractive index of PDA. In addition, due to excellent adhesion and biocompatibility properties of PDA, an extra layer of PDA is modified on the surface of AuNps to anchor a layer of goat anti-rabbit IgG on it, which is a bioassay for rabbit IgG. The experimental results show that the sensor obtains a high sensitivity of 4301.49 nm/RIU in the refractive index (RI) range of 1.335 ~ 1.365, which is 2.4 times the RI sensitivity of the PCF-Au sensor. The bio-sensitivity of the sensor for rabbit IgG reaches 1.017 nm/(µg/ml), and the limit of detection (LOD) is 0.019 µg/ml. This sensitized fiber-optic biosensor based on the SPR-LSPR coupling effect has a potential application in clinical disease diagnosis and immunoassay.
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