IEEE SENSORS JOURNAL
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2026
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IF 4.5
Pengxia Li,Zhifei Cao,Bin Xie,Guowei Yang,Yifei Ma,Mei Wang,Suotang Jia,Xuyuan Chen,Zhaomin Tong
Gas sensors play a vital role in human health monitoring, particularly for detecting disease-related biomarkers in exhaled breath. However, conventional metal-oxide semiconductor gas sensors face limitations in wearable respiratory monitoring applications due to their inflexibility and high heat loss. Here, we fabricated an Au-ZnO fibre-based gas sensor for the detection of ammonia (NH3), an indicator of kidney dysfunction. The device is constructed from a composite flexible fibre comprising a liquid-metal core and a silica cladding, onto which an Au-ZnO gas-sensing layer is synthesised in situ. Liquid metal directly conducts thermal energy to the insulating cladding through Joule heating, providing thermal energy to the gas-sensing layer. This design enables low heat loss and low-current operation while generating sufficient thermal energy to enhance the gas-sensing response. The resulting Au-ZnO fibre sensor exhibits a stable high response to NH3 (response of 2.2 to 2 ppm NH3) even under bending (bending radius of 15 mm). The response time and recovery time are 153 s and 156 s at a working temperature of 280 oC. This demonstrates that the Au-ZnO fibre sensor has good flexibility and suitability for wearable respiratory monitoring. To showcase its practical utility, a real-time monitoring sensor system was developed by designing a signal detection circuit, and the concentration of NH3 was monitored in real time through different coloured light-emitting diodes. This work presents a practical, home-based approach for respiratory monitoring of NH3 and offers a simple, effective solution to distinguish between healthy individuals and patients with different stages of kidney disease.
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PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Yongkai Xie,Zhongyao Zhang,Xiangxue Zhang,Wenyao Chen,De Chen,Xinggui Zhou,Xuezhi Duan
Strong metal-support interactions (SMSI) are pivotal for constructing interfacial active sites, yet its precise regulation remains a formidable challenge. Here, we report a facile strategy to modulate the atmosphere-dependent SMSI in Au/ZnO catalysts by strictly regulating the oxygen partial pressure during thermal treatment. We reveal that the encapsulation degree of Au particles exhibits a volcano-shaped dependence on oxygen partial pressure, which drives electron transfer from Au to the support to create abundant interfacial oxygen vacancies (Au–O V –Zn). For the oxidative esterification of methacrolein, mechanistic investigations reveal that these interfacial defects constitute frustrated Lewis acid–base pairs to promote the formation of hemiacetal intermediates, and simultaneously serve as active sites for oxygen activation. The activated lattice oxygen migrates to the Au surface and generate active Au–O species that effectively overcome the kinetic barrier of the rate-determining β-H elimination. Driven by this interfacial synergy, the catalyst exhibiting the most pronounced SMSI achieves state-of-the-art performance with an MMA yield of 91.8%. These findings provide a new strategy for the design of high-performance catalysts via interfacial defect engineering.
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ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Peng Zhu,Weizi Zhang,Qinfang Li,Haian Xia
Photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is an environmental friendly way to convert platform molecules into high-value chemicals. Here, Au/ZnO catalysts with different oxygen vacancies were fabricated by the deposition precipitation method and were used for the photocatalytic oxidation of HMF to FDCA under visible light irradiation. All of the Au/ZnO catalysts showed excellent photocatalytic oxidation selectivity to FDCA greater than 90% under mild conditions. The Au/ZnODP-H catalyst treated by H2 afforded the highest HMF conversion and the selectivities of FDCA up to 96.9%. The localized surface plasmon resonance effect of Au nanoparticles, oxygen vacancy, and the existence of the Schottky barrier enhance the separation and transfer efficiency of photogenerated electron–hole pairs of the catalyst, so as to enhance its photocatalytic activity. The active species trapping experiment and electron spin resonance analysis showed that •O2– and h+ were the active species responsible for the oxidation reaction. The recycle experiment also proved that the catalyst has good stability. This work provides a new strategy for the design of photocatalysts for converting biomass into high-value chemicals.
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Journal of Physical Chemistry C
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2022
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IF 4.177
Wei Liu,Hongpeng Liu,Yatian Liu,Zejian Dong,Langli Luo
In heterogeneous catalysis, specific surface planes of metals and/or supports have a prominent effect on the catalytic processes, i.e., adsorption, dissociation of reactants, and electron transfer behaviors. In addition, surface planes of oxide supports have a direct impact on the shape and dispersion of metal particles through a metal–support interaction. Herein, we synthesized ZnO nanoplates (p-ZnO) exposing mostly polar surfaces and ZnO nanorods (r-ZnO) exposing non-polar surfaces and used them as supports to prepare Au/ZnO catalysts. Then, the surface plane effect of ZnO was demonstrated by employing the CO oxidation reaction. We found that the activity of Au/p-ZnO is superior to that of Au/r-ZnO, which is due to more O2 activation sites on polar surfaces than on non-polar surfaces. Furthermore, Au can activate both polar and non-polar surfaces of ZnO by creating more oxygen vacancies for O2 activation. This study highlights the effects of different surface planes of oxides in catalytic reactions and provides new insights for the development of highly active metal-oxide catalysts.
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RSC Advances
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2017
·Vol. 7
·期 61
·38444-38451
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IF 3.108
Jia Xia,Kaidi Diao,Zhou Zheng,Xudong Cui
The design of porous metal oxides with noble metal doping has attracted tremendous attention due to their vital importance for gas sensing applications. Herein, we report the synthesis of porous Au/ZnO nanoparticles (NPs) through a facile metal organic framework (MOF) route. The structures, sensing properties, as well as sensing mechanisms of products are carefully investigated. The porous Au/ZnO NPs show a high gas-sensing response (17.1 ppm−1) and selectivity towards low concentration acetone at an optimum temperature of 275 °C. The enhanced sensing performances are ascribed to the chemical and electronic sensitization of Au NPs, the porous structure and the high specific surface area of Au/ZnO NPs. Our studies might provide a simple MOF-derived method to synthesize porous structures with noble metal doping and would be beneficial to the development of high performance gas sensing materials.
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Inorganic Chemistry Frontiers
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2017
·Vol. 4
·期 12
·2088-2096
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IF 4.036
Benxia Li,Renshan Wang,Xiankun Shao,Liangzhi Shao,Baoshan Zhang
In this work, a new design of ternary core–shell nanostructures of Au@ZnO–Pd was demonstrated to realize the synergetic utilization of a plasmonic effect and an electron-trapping co-catalyst for enhanced photocatalytic performance. In the ternary hybrid nanostructures, ZnO provides photo-generated carriers with higher redox ability, under UV-visible light, and Au nanocrystals perform the plasmonic hot electron injection as well as the local electromagnetic field enhancement of ZnO photoexcitation. Meanwhile, the Pd NPs can efficiently trap the generated electrons to govern the directional separation of the charge carriers. The efficient charge carrier separation in the ternary hybrid nanostructures was confirmed by steady-state PL spectra, time-resolved PL decay spectra, and transient photocurrent responses. The photocatalytic activity of the Au@ZnO–Pd nanostructures was evaluated by photodegrading phenol and methylene blue, respectively, under simulated sunlight (λ = 360–780 nm), and the results showed that the Au@ZnO–Pd nanostructures gained a great enhancement of photocatalysis compared with ZnO, ZnO–Pd and Au@ZnO. Moreover, the effect of Pd loading content in the Au@ZnO–Pd nanostructures on the photocatalytic efficiency was studied within a certain range, indicating that the Au@ZnO–Pd photocatalyst with ∼1.8 wt% Pd loading exhibited the best photocatalytic activities for photodegrading both phenol and methylene blue. The generation and effect of active species in the photocatalytic process were investigated using ESR testing and radical scavenging experiments. As a consequence, the integration of the ternary Au@ZnO–Pd core–shell nanostructures could achieve collective effects to greatly increase the photocatalytic efficiency.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Chenxuan Ai,Xueli Yang
MOF-derived ZnO and Au-ZnO materials were synthesized via a coprecipitation method. • The response value of 0.5 wt% Au-ZnO to 100 ppm n-butanol is 649.77 at 250 °C. • Response time is just one second, enabling real-time detection of n-butanol. • This sensor has a low detectable concentration, excellent selectivity and stability. N-butanol is a flammable volatile organic compound (VOCs) posing potential threats to human health and environmental quality, making its real-time detection critically important. Although Au-functionalized MOF-derived ZnO has been investigated for gas sensing, the influence of Au loading on surface-defect regulation and n-butanol sensing behavior remains insufficiently understood. Herein, porous ZnO rhombic dodecahedra derived from ZIF-8 were functionalized with controlled Au loadings of 0.25, 0.5, and 0.75 wt%. The optimized 0.5 wt% Au-ZnO sensor exhibited a response of 649.77 and a response time of 1 s towards 100 ppm n-butanol at 250 °C, with the response being approximately 3.6 times that of pristine ZnO. A measurable response of 1.41 was obtained at 50 ppb, representing the lowest experimentally verified concentration in this study. The sensor also demonstrated good selectivity, repeatability, and long-term stability. XPS analysis showed that the 0.5 wt% Au-ZnO sample possessed the highest relative oxygen-vacancy content of 34.8%. DFT calculations further suggested a stronger adsorption tendency of n-butanol on the Au-ZnO surface than on pristine ZnO. These results demonstrate that controlled Au loading provides a favorable balance among interfacial charge modulation, oxygen-vacancy regulation, catalytic activity, and adsorption-desorption kinetics. The dodecahedral structure of the MOF-derived ZnO confers high sensitivity to n-butanol on the sensor, providing uniform anchoring sites for gold nanoparticles (Au NPs). Through Schottky barrier modulation, catalytic effects and oxygen vacancy enhancement, the modification with Au NPs further improves the capture efficiency and signal amplification for n-butanol concentrations in the ppb range. Download: Download high-res image (231KB) Download: Download full-size image
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BIOSENSORS & BIOELECTRONICS
·
2018
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IF 8.173
Jinhui Feng,Faying Li,Xiaojian Li,Yaoguang Wang,Dawei Fan,Bin Du,Yueyun Li,Qin Wei
A new, photoelectrochemical immunosensor was proposed on the basis of the La-CdS/3D ZnIn 2 S 4 /Au@ZnO sensitization structure for detection of aminoterminal pro-brain natriuretic peptides (NT-proBNP). The Au@ZnO-modified electrode was first assembled with 3D ZnIn 2 S 4 , and then further deposited with lanthanum doped cadmium sulfide (La-CdS) via successive ionic layer adsorption and reaction strategy. The Au@ZnO has excellent photoelectric activity and electrical conductivity . The ZnIn 2 S 4 with 3D architectures not only exhibit high photocurrent intensity under visible-light irradiation but also have large surface for the La-CdS deposition. Meanwhile, the La-CdS doped structure could depress the charge recombination, which effectively promotes separation of the generated electron-hole (e - /h + ) pairs and consequently enhances the photocurrent conversion efficiency. The polydopamine (PDA) was used not only as a cross-linker reagent for the immobilization of the anti-NT-proBNP but also as an electron donor for promoting the photo-generated e - /h + separation of the semiconductors. Under optimal conditions, the well-designed photoelectrochemical immunoassay exhibited a low detection limit of 0.32 pg mL −1 and a wide linear range from 0.8 pg mL −1 to 45 ng mL −1 for target NT-proBNP detection. Meanwhile, it also presented good reproducibility, specificity, and stability and might open a new promising strategy for the detection of other important tumor markers.
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Sustainable Energy & Fuels
·
2024
·
IF 5
Xueyang Ren,Jie Zheng,Jinxian Zhao,Jun Ren,Yanhong Quan
The one-step oxidative esterification of ethylene glycol (EG) is an effective and promising route for methyl glycolate (MG) synthesis, during which the development of efficient catalysts is critically crucial. Herein, Au/ZnO catalysts were prepared using impregnation (IM), colloidal-deposition (CD), deposition-precipitation (DP) and co-precipitation (CP) methods, respectively. The catalytic activities results revealed that the Au/ZnO-DP catalyst was far superior than the other three catalysts, achieving an EG conversion rate of 90.4% and a selectivity towards MG of 93.8%. Catalysts were systematically characterized by N2 adsorption-desorption, XRD, TEM, XPS, H2-TPR, EPR, O2-TPD and CO2-TPD. The results showed that the large number of Au-ZnO interfaces facilitated the adsorption and activation of O2. Moreover, it is found that the basic sites promoted the cleavage of O-H bonds in the EG molecules, and the acidic sites are responsible for the selectivity of MG. This work offers a simple strategy for design of gold catalysts in EG oxidative esterification.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Jie Zheng,Zihui Qin,Shiping Wu,Jinxian Zhao,Jun Ren
A series of ZnO nanostructures with different morphologies were prepared with hydrothermal synthesis method by adjusting the NaOH/Zn 2+ molar ratio. The Au/ZnO catalysts were further synthesized and investigated in the oxidative esterification of ethylene glycol (EG) in methanol to methyl glycolate (MG). As compared with prismatic Au/ZnO(2.0) and fusiform-shaped Au/ZnO(8.0), the flaky-shaped Au/ZnO(3.5) catalyst shows a significantly decreased Au particle size of 3.4 nm as well as superior catalytic performance with the EG conversion of 94.5 % and the selectivity of 91.8 % towards MG. The characterization results imply that the reaction undergoes three successive steps including glycol oxidation (the rate-determining step), nucleophilic addition of glycolaldehyde with methanol and oxidative dehydrogenation of hemiacetal. The small Au nanoparticles and abundant defective surface oxygen species (O V ) promote the generation of activated oxygen species (O δ- ), which facilitate the cleavage of C-H bonds in alkoxide intermediate methylene (–CH 2 ) as well as hemiacetal aldehyde groups (–CHO) and thereby boost the formation of MG. Moreover, base sites adsorbed the alcohol to facilitate the O-H bond cleavage and acid sites adsorbed hemiacetal or intermediate alkoxide to drive the reaction. The strong interaction at the Au-ZnO interface affords the superior catalytic performance of Au/ZnO(3.5) in the oxidative esterification of EG in methanol to MG.
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Nano Energy
·
2021
·
IF 17.881
Kongshuo Ma,Guohua Qi,Bo Wang,Tengfei Yu,Ying Zhang,Haijuan Li,Shimeles Addisu Kitte,Yongdong Jin
Integrating the advantages of multiple therapies into one therapeutic platform is highly desired for augmented treatment effects. Herein, by modifying MLS and PEG on ZnO-nanorods/AuNPs nanoassemblies and coating with C6 cell membrane (MP-Au/ [email protected] ), we construct a novel ultrasound-activatable Au/ZnO-based tumor therapeutic platform (Trojan nanogenerators) and exploit it for effective tumor therapy. The developed MP-Au/ [email protected] nanogenerators worked well in multiple ways to achieve targeted electrostimulation and enhanced catalytic therapy of tumor, under ultrasound excitation. Firstly, the ZnO-nanogenerators will generate a piezoelectric potential difference of about 140 mV by ultrasonic excitation when targeted (by MLS moiety) to the mitochondria, disrupting the mitochondrial membrane potential for electrostimulation. Secondly, the nanogenerators enhances greatly multiple enzyme-like activities of Au nano-components for enhanced tumor catalytic therapy. Among them, the affinity and maximum reaction rate of peroxidase-like are increased by 34.99% and 53.36% respectively through kinetic analysis . Simulations and calculations revealed the roles of piezoelectric polarization electric field and displacement current in enhancing catalytic activity . The superior tumor suppressive effect of the MP-Au/ [email protected] was confirmed by in-vitro cell study and in-vivo C6 tumor-bearing mouse models. The developed ultrasound-activated nanogenerators will provide a unique electrostimulation tumor therapy strategy and opens a new way for improving the therapeutic efficacy of nanozymes.
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JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 156
·期 17
·
IF 4.304
Xi Xiaonan,Li Yuanyuan,Liang Tianyuan,Wu Huaxin,Miao Ruonan,Gu Chao,Fan Jiyang
The semiconductor–metal heteronanocrystals (HNCs) that possess a perfect epitaxial interface can accommodate novel and interesting physical phenomena owing to the strong interaction and coupling between the semiconductor excitons and metal plasmons at the interface. Here, we fabricate the pyramidal ZnO–Au HNCs and study their unique photophysical properties. Several Au nanospheres are perfectly epitaxially bound with a single ZnO NC owing to the small lattice mismatch between them and there are also ZnO–Au–ZnO sandwiched HNCs. There is a strong coupling between the green defect-associated recombination in the ZnO NC and the localized surface plasmon resonance (LSPR) of the Au nanosphere at the interface of the HNC. This leads to resonant defect recombination–LSPR energy transfer and resultant nearly complete quenching of the green defect luminescence of the ZnO NCs in the HNCs, leaving only the UV exciton luminescence. The lifetimes of both the green and UV emission bands decrease significantly in the ZnO–Au HNCs relative to that of the pure ZnO NCs owing to the combined effect of resonance energy transfer and surface plasmon enhanced radiative transition. The exponent of the luminescence intensity–excitation intensity power function for the green emission band is remarkably smaller than unity, and this suggests that the involved defects have an intermediate concentration.
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