SENSORS
·
2024
·Vol. 24
·期 24
·8100
·
IF 3.4
Zhenchao Sun,Shanfu Sun,Xidong Hao,Yinglin Wang,Caili Gong,Pengfei Cheng
Toxic acetone gas emissions and leakage are a potential threat to the environment and human health. Gas sensors founded on metal oxide semiconductors (MOS) have become an effective strategy for toxic gas detection with their mature process. In the present work, an efficient acetone gas sensor based on Au-modified ZnO porous nanofoam (Au/ZnO) is synthesized by polyvinylpyrrolidone-blowing followed by a calcination method. XRD and XPS spectra were utilized to investigate its structure, while SEM and TEM characterized its morphology. The gas sensitivity of the Au/ZnO sensors was investigated in a static test system. The results reveal that the gas-sensitive performance of porous ZnO toward the acetone can be enhanced by adjusting the loading ratio of noble Au nanoparticles. Specifically, the Au/ZnO sensor prepared by the Au loading ratio of 3.0% (Au/ZnO-3.0%) achieved a 100 ppm acetone gas response of 20.02 at the optimum working temperature of 275 °C. Additionally, a portable electronic device used a STM32 primary control chip to integrate the Au/ZnO-3.0% gas sensor with other modules to achieve the function of detecting and alarming toxic acetone gas. This work is of great significance for efficiently detecting and reducing acetone emissions.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 1.6
Yubo Yang,Yanxia Zheng,Lu Cai,Yuchao Li,Rui Xu,Cuncun Zuo,Haofei Huang,Ming Wang,Ruihui Dai,Liping Zhang,Yansong Zhao
Au-Pd alloy particles supported on TiO 2 were synthesized by the sol-immobilized method and their confirmation was achieved through transmission electron microscope (TEM) and energy dispersive spectrometer (EDS) mapping. The samples were subjected to oxidative esterification of methacrolein with methanol to methyl methacrylate (MMA). Notably, a remarkable enhancement of catalytic performance was found in the presence of Pd. Among the samples tested, the sample Au 0.25 Pd 0.75 /TiO 2 exhibited the highest catalytic performance. The interaction between Au and Pd demonstrated a synergistic effect, with Pd contributing to the stability of Au nanoparticles and strengthening the production of active oxygen species, which facilitated the efficient removal of hydrogen from intermediate hemiacetal. Furthermore, a probable reaction mechanism was proposed to explain these observations.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Jianxia Qi,Wanting Zhou,Chengyuan Yang,Wen Liu,Chang Guan,Chengyun Zhang,Qingyan Han,Wei Gao,Lipeng Zhu,Jun Dong
This paper presents the design of a bottom-up "sandwich" configuration substrate via electrostatic self-assembly. A silver microplate (AgMP) serves as the stable structural base, onto which monolayer graphene is wet-transferred. Au@Ag nanocubes (Au@Ag NCs) are then assembled on the upper layer through liquid-liquid three-phase self-assembly, forming a Au@AgNCs/G/AgMP “sandwich” substrate. The combination of electromagnetic enhancement from noble metal nanoparticles and chemical enhancement from graphene synergistically amplifies the signal of detected molecules, leading to significant Surface-Enhanced Raman Scattering (SERS) enhancement. Experimental results demonstrate that this substrate can detect Rhodamine 6 G (R6G) at concentrations as low as 10 –12 M and Crystal Violet (CV) at 10 –9 M. Moreover, the substrate can detect Aspartame (APM) at concentrations as low as 0.0625 g/L, well below the typical daily intake levels for humans. These findings indicate that the substrate exhibits excellent SERS performance and holds significant potential for broad applications.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-10
·
IF 5.3
Liao Song,Gui Liuyang,Yang Yufan,Liu Yiwei,Hu Xiaopeng
A dual-mode fluorescence/visual aptasensor was developed for straightforward and accurate determination of aflatoxin B1 (AFB1) based on an Au/metal–organic framework (Au/MOF) composite. Aptamer-modified Au/Fe 3 O 4 (Apt/Au/Fe 3 O 4 ) served as the recognition element, and Au/MOF modified with complementary chains and 3,3′,5,5′-tetramethylbenzidine (cDNA/TMB/Au/MOF) acted as the fluorescence and visual probes. These components are integrated to form conjugates (Apt/Au/Fe 3 O 4 -cDNA/TMB/Au/MOF). Upon the introduction of AFB1, some cDNA/TMB/Au/MOF dissociated from Apt/Au/Fe 3 O 4 , enabling the use of detached probes for visual detection. The undecomposed conjugates were isolated magnetically for use in fluorescence detection. As the AFB1 concentration increases, the visual signal intensifies and fluorescence intensity diminishes. Thus, the proposed aptasensor achieves the simultaneous fluorescence and visual determination of AFB1, obviating the need for material and reagent substitutions. The detection limits were established at 0.07 ng mL −1 for the fluorescence mode and 0.08 ng mL −1 for the visual mode. The effectiveness of the aptasensor was further validated by quantifying AFB1 in real samples. Graphical Abstract
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2024
·
IF 2.2
Lipeng Wang,Mengjiao Zheng,Longjie Lai,Rui Wang,Tongton Qian,Li Zhang,Waqar Younas,Guobing Mao,Qi Liu
Graphical Au nanoparticles and PB-modified ZnIn 2 S 4 composite photoanode are successfully prepared on FTO substrates. The ZnIn 2 S 4 /Au/PB photoanode achieves a photocurrent density of 0.42 mA/cm 2 at 1.23 V RHE under light illumination alongside a high incident photon-to-electron conversion efficiency (IPCE) value of 24.6 %. ZnIn 2 S 4 has been regarded as a promising photoanode material for photoelectrochemical (PEC) water splitting. However, its severe charge recombination and low carrier transport efficiency limit practical applications in PEC water splitting. A novel ZnIn 2 S 4 /Au/PB photoanode was prepared by using the in-situ photodeposition of Au nanoparticles and electrodeposition of Prussian blue (PB) nanoparticles onto ZnIn 2 S 4 nanosheets. The photocurrent density of the prepared ternary photoanode reached 0.42 mA/cm 2 at 1.23 V RHE , which is 6 times higher than pure ZnIn 2 S 4 . The introduction of Au nanoparticles remarkably improved the efficiency of carrier transport and separation. Additionally, the application of PB onto ZnIn 2 S 4 resulted in an extended spectrum of light absorption. The incident photon-to-current efficiency (IPCE) value recorded was 24.6 % at 350 nm. This improvement can be attributed to the formation of a Z-type heterojunction.
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Analytical Methods
·
2024
·
IF 2.7
Yuchen Zhou,Wanchun Chen,Guangyuan Wang,Zhenfeng Lei,Mei Zhang,Yanxia Li
A label-free immunosensor based on N-doped laser direct graphene (N-LIG)/Au electrode was proposed for H1N1 influenza virus detection. By utilizing the instantaneous high temperature of laser irradiation, N atoms generated by the decomposition of melamine dripped onto the surface of LIG electrode to obtain N-LIG with higher conductivity. The doping of N atoms provides a large number of active sites for LIG microelectrodes. Combined with the electrodeposition of Au NPs, and covalently crosslinking antibodies, a simple, highly sensitive and stable immunosensing interface is constructed. The proposed H1N1 influenza virus immunosensor has a detection range of 0.01 fg mL-1 to 10 ng mL-1 with a detection limit as low as 0.004 fg mL-1. The constructed sensor has ultra-high sensitivity, good selectivity, and can be used for complex biological sample analysis, with potential application prospects in preventing the large-scale spread of influenza. Taking advantage of N-LIG electrode’s properties will provide opportunities for developing portable electrochemical biosensors for health and environmental applications.
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RSC Advances
·
2024
·Vol. 14
·期 27
·19284-19293
·
IF 3.9
Tao Li,Zhuo Li,Fengjiao Chen,Liying Zhu,Hua Tang,Dan Wang,Zhenrong Tang
Bovine serum albumin-stabilized Au nanoclusters (BSA-Au NCs) have emerged as promising contenders for imaging agents and highly sensitive fluorescence sensors due to their biocompatibility and strong photoluminescence. Optimizing the synthesis conditions of BSA-Au NCs is crucial for enhancing fluorescence imaging and other nanocluster applications. In this study, for the first time, we systematically investigated the effects of BSA concentration and Au3+ on both particle size and optical characteristics of BSA-Au NCs. When the two components achieved a suitable concentration ratio, it was beneficial to form BSA-Au NCs with a high quantum yield (QY = 74.30%) and good fluorescence stability. In contrast, an inappropriate concentration ratio would lead to the formation of gold nanoparticles (Au NPs), and their internal filtration effect (IFE) would attenuate the fluorescence emission of BSA-Au NCs. The BSA-Au NCs were then employed as efficient fluorescence sensors for detecting Hg2+. Furthermore, the growth mechanism of BSA-Au NCs was elucidated by monitoring fluorescence changes during different incubation times. The BSA-Au NCs with a high quantum yield introduce a novel synthetic concept for sensitive fluorescent probes and expanding versatile applications of BSA-Au NCs in catalysis, chemical sensing and biomedicine.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 20
·8750-8755
·
IF 3.5
Wenbo Zhao,Mengyao Li,Shi Hu
Direct ethanol fuel cells (DEFCs), which have been widely recognized as nontoxic and green energy conversion devices, show attractive application prospects for liquid hydrogen-carriers, due to the higher specific energy and lower toxicity of ethanol. Pt-based catalysts are widely used in DEFCs, while their poor poisoning resistance highlights the importance of composition and structure optimization. Herein, we synthesized a series of reduced graphene oxide supported ternary alloy AuxPt1−xCu3/rGO (x = 0-1) catalysts with excellent ethanol oxidation performance and a composition-dependent volcano plot trend of the ordering degree was observed and rationalized. The highest Pt-normalized mass activity of Au0.8Pt0.2Cu3/rGO is attributed to the optimized CO binding energy according to DFT calculations. This work not only provides an efficient EOR catalyst based on ordered alloys AuxPt1−xCu3 (x = 0-1), but also offers valuable insight into the role of a third metal in tuning the structure and function of alloys.
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ACS Sensors
·
2024
·
IF 8.2
Fan Zhao,Lingmin Yu,Jingfeng Wang,Wei Cao,Hao Zhang,Hairong Wang,Pu-Hong Wang,Zhihong Qiao
Achieving selective detection of ppb-level CO is important for air quality testing at industrial sites to ensure personal safety. Noble metal doping enhances charge transfer, which in turn reduces the detection limit of metal oxide gas sensors. In this work, metal–organic framework-derived Au-doped In2O3 nanotubes with high electrical conductivity are synthesized by pyrolysis of the Au-doped metal–organic framework (In-MIL-68) as a template. Gas-sensing experiments reveal that the detection limit of 0.2% Au-doped In2O3 nanotubes (0.2% Au, mass fraction) is as low as 750 ppb. Meanwhile, the sensing material shows a response value of 18.2 to 50 ppm of CO at 240 °C, which is about 2.8 times higher than that of pure In2O3. Meanwhile, the response and recovery times are short (37 s/86 s). The gas-sensing mechanism of CO is uncovered by in situ DRIFTS through the reaction intermediates. In addition, first-principles calculations suggest that Au doping of In2O3 significantly enhances its adsorption energy for CO and improves the electron transfer properties. This study reveals a novel synthesis pathway for Au-doped In2O3 nanotubular structures and their potential application in low concentration CO detection.
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IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Song Xie,Haotian Wu,Xiaozhan Yang
A microfluidic electrochemical sensor is fabricated for the measurement of chemical oxygen demand (COD) in surface waters such as lakes and reservoirs. An Au interdigital electrode is used as a substrate, and a layer of Au nanoparticles (AuNPs) is deposited on the working electrode surface to form a functionalized working electrode. A polydimethylsiloxane (PDMS) microfluidic device was fabricated and integrated with the AuNPs/Au to form a PDMS-AuNPs/Au microfluidic electrochemical sensor. Water samples are transferred into and out of the sensor through a peristaltic pump and Tygon tubes, and the online COD detection was achieved using an electrochemical workstation. The linear range of the sensor is 0-400 mg/L, and the detection limit is 0.12 mg/L, which is much lower than the concentration limit of 20 mg/L specified by the Chinese national standard. In addition, five real water samples are evaluated, and the COD values are in good agreement with that of the standard method. The size of the sensor is only 30 mm×10 mm×5 mm, each measurement can be obtained within 3 minutes, and no toxic reagents are needed. In addition, the sensor has good convenience and integration, and provides a new idea for online COD detection.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2024
·Vol. 22
·期 1
·1-21
·
IF 10.6
Wang Yanan,Zhang Qi,Kan Minrui,Chang Fei,He Xiaoyun,Cheng Nan,Huang Kunlun
Au@Pt nanozyme, a bimetallic core–shell structure Au and Pt nanoparticle, has attracted significant attention due to its excellent catalytic activity and stability. Here, we propose that Au@Pt improves glucose tolerance and reduces TG after four weeks administration. The transcriptomic analysis of mouse liver tissues treated with Au@Pt nanozyme showed changes in genes related to glucose and lipid metabolism signaling pathways, including glycolysis/gluconeogenesis, pyruvate metabolism, PPAR signaling, and insulin signaling. Moreover, analysis of fecal samples from mice treated with Au@Pt nanozyme showed significant changes in the abundance of beneficial gut microbiota such as Dubosiella , Parvibacter , Enterorhabdus , Monoglobus , Lachnospiraceae_UCG-008 , Lachnospiraceae_UCG-006 , Lachnospiraceae_UCG-001 , and Christensenellaceae_R-7_group . Combined multi-omics correlation analyses revealed that the modulation of glucose and lipid metabolism by Au@Pt was strongly correlated with changes in hepatic gene expression profiles as well as changes in gut microbial profiles. Overall, our integrated multi-omics analysis demonstrated that Au@Pt nanozyme could modulate glucose and lipid metabolism by regulating the expression of key genes in the liver and altering the composition of gut microbiota, providing new insights into the potential applications of Au@Pt nanozyme in the treatment of metabolic disorder. Graphical Abstract
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Journal of Physical Chemistry C
·
2024
·
IF 3.3
Wenhao Xu,Yujie Cao,Binhang Wang,Zitao Zhang,Xiang Li,Libo Sun,Guangnan Liu,Yun Tang
Metal–metal oxide nanostructures have drawn increasing research attention due to their unique properties enabled by strong interfacial interactions. However, the synthesis of metal–metal oxide nanocomposites with well-controlled architectures such as the core@shell structure remains challenging. Additionally, introducing plasmonic metal can endow the nanomaterials with photoresponsive functions, offering opportunities for optical modulation of catalytic properties. In this work, we designed and fabricated an over-reduced Au@CoOx-Co core–shell nanostructure using an improved seed growth process involving carbonyl precursors. The Au core serves as an in situ catalyst facilitating the over-reduced CoOx-Co shells, and the strong interfacial interaction introduces abundant oxygen vacancies (OVs) to provide reactive sites. Meanwhile, the Au core generates excitons under light irradiation, which can significantly enhance the activation of peroxymonosulfate (PMS) for degrading fluorine-containing pollutants. This design synergistically integrates structural design, photoelectronic regulation, and catalytic enhancement, demonstrating a promising application in the future.
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