APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Haolin Li,Jianwei Ding,Shuangfei Cai,Wei Zhang,Xining Zhang,Ting Wu,Chen Wang,Morten Foss,Rong Yang
Using sunlight as renewable resource has stimulated the development of sustainable photocatalysts that can collect visible light. Semiconductor nanowire-based photocatalysts have attracted increasing interest due to their unique optical, electronic, and structural advantages. Here, noble metal-semiconductor hybrid Au/ZnO nanowires have been fabricated by chemical vapor deposition method. The hybrid photocatalysts were well characterized by SEM, TEM, EDS, XRD, XPS, UV–visible spectroscopy and Raman spectroscopy. Compared with ZnO nanowires, Au/ZnO heterostructures exhibited significantly enhanced photocatalytic performance due to the synergistic combination of Au and ZnO. Optical properties were modeled to support our interpretation of photocatalytic mechanisms. Our work provides a feasible strategy to prepare plasmonic photocatalysts and will also deepen the understanding of the plasmon enhanced photocatalytic performance in hybrid photocatalysts.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2025
·
IF 3.3
Hanben Zhou,Run Liu
A composite was formed to improve the photo-generated carrier separation rate of semiconductor oxides synthesized by in-situ electrodeposition and calcination. ZnO/g-C3N4 was deposited on the surface of Au/FTO through simultaneous adsorbing during electrodeposition and calcination. Characterization showed the g-C3N4 layer was an ultrathin protective film above the surface of ZnO. The composite Au/ZnO/g-C3N4 had a photocurrent up to 0.24 mA/cm2 at 1.23V vs RHE, 70% higher than bare ZnO. In this structure, the holes of ZnO generated by lights can transfer to the g-C3N4 layer and electrons can transfer to the gold layer, accelerating charge transfer and reducing the accumulation of holes on the surface of ZnO, enhancing the photoresponse and stability. The separation of holes by g-C3N4 is a critical part of this structure.
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Science China-Chemistry
·
2015
·Vol. 58
·期 5
·858-862
·
IF 1.695
Tang Jia,Zhou Bin,Zhang Shilin,Wang Zhuang,Xiong Lei,Li Peng
Unique lotus-rootlike Au-ZnO hybrid structures were obtained by controlling the deposition of pre-synthesized Au nanocrystals onto the surfaces of as-obtained ZnO structures. ZnO with lotus-rootlike structures was first prepared through a hydrothermal process. We also investigated the effects of various Au contents on the photocatalytic activities in detail. Notably, compared to the pure ZnO component, these resulting lotus-root-like Au-ZnO nanostructures with the appropriate amounts of Au content exhibited better photocatalytic efficiency.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Shiya Rong,Pengfei Cheng,Weiming Song,Xuyan Zhang,Jieming Huang,Guofu Zhou,Zhang Zhang,Junming Liu
Core-shell nanostructures have attracted the interest of many researchers due to their unique structural features and suitable band structure match. However, the fabricated core-shell nanostructures generally have only one core, which makes it challenging to explore the collective effect of multiple cores. Herein, two kinds of multicore-shell Au@ZIF-8 and Au@ZnO were synthesized, focusing on the effect of Au concentration on the optical and photocatalytic properties of the latter. By controlling the concentration of Au precursor, different quantities of Au NPs can be encapsulated in one ZIF-8 nanocrystal. Consequently, the hybridization effect and its localized surface plasmon resonance effect of Au NPs could also be accordingly regulated, with Au-0.4@ZnO showing the best photocatalytic activity. This work offers a new inspiration on regulating the plasmonic properties of the multicore-shell nanostructure, which holds an appealing prospect in plasmonic photocatalysis, surface-enhanced Raman scattering detection, and intermediates identification in catalytic reactions.
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Nanoscale
·
2022
·Vol. 14
·期 35
·12804-12813
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IF 8.307
Meihuan Liu,Jiamiao Jiang,Haixin Tan,Bin Chen,Juanfeng Ou,Hong Wang,Jia Sun,Lu Liu,Fei Wang,Junbin Gao,Chang Liu,Fei Peng,Yun Liu,Yingfeng Tu
The abuse of antibiotics in human medicine and animal husbandry leads to the enrichment of antibiotic residues in aquatic environments, which has been a major problem of environmental pollution over the past decades. Therefore, it is urgent to develop a highly efficient approach to remove antibiotics from aquatic environments. Inspired by the motion characteristics of semiconductor-based micro-/nanomotors, a light-driven Au–ZnO nanomotor system based on vertically aligned ZnO arrays is successfully developed for the enhanced photocatalytic degradation of tetracycline (TC). Under UV light (λ = 365 nm) illumination, these Au–ZnO nanomotors exhibit a high speed in deionized water and TC solution. Due to their efficient motion capability and Au-enhanced charge separation, these light-driven Au–ZnO nanomotors removed almost all TC (40 mg L−1) within 30 min and displayed stable photocatalytic activity for four cycles without any apparent deactivation. The as-developed motor-based strategy for enhanced antibiotic degradation has excellent potential in environmental governance.
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ACS Catalysis
·
2022
·
IF 13.7
Yanwei Cao,Yao Peng,Danyang Cheng,Lin Chen,Maolin Wang,Cheng Shang,Lirong Zheng,Ding Ma,Zhi-Pan Liu,Lin He
The conversion of carbon monoxide (CO) into high-value organic molecules has long been pursued by both industry and academia. One of the central challenges is to realize carbon–carbon coupling with high selectivity for CO insertion. We report here a highly selective Au/ZnO composite catalyst for one-step oxidative coupling of CO with secondary amines, producing oxamides. The reaction is >99% selective under ambient conditions, which exhibits a subtle change of catalyst activity over ∼120 h in a fixed-bed reactor. A combination of microscopic and spectroscopic studies (including X-ray photoemission spectroscopy, X-ray absorption spectroscopy, CO-Fourier transform infrared spectroscopy, and aberration-corrected high-angle annular dark-field scanning transmission electron microscopy) and machine learning reveal that the active site is the Au–ZnO interface with a Au nanocluster attached to the ZnO support via nonstoichiometric ZnOx (x > 1) linkages. The reaction mechanism and key reaction intermediates were confirmed by density functional theory calculations and in situ diffused reflectance infrared Fourier transform spectroscopy signals. Our results open an avenue in heterogeneous catalysis to achieve the ambient-condition CO transformation by exploiting the interfacial synergistic effects.
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Coatings
·
2025
·Vol. 15
·期 12
·1439
·
IF 2.8
Yumeng Zhang,Chao Gu,Hong Li,Dechuan Li
Au–ZnO heterogeneous nanoparticles (NPs) were successfully synthesized, and the intrinsic correlation between their spectral evolution and interfacial growth mechanism was systematically elucidated. With increasing Au content, the SPR absorption peak of Au exhibits a pronounced red shift, while the defect-related emission of ZnO is suppressed and the band-edge emission becomes broadened. These spectral variations are closely coupled with the interfacial growth process. Interfacial electron transfer and the formation of a Schottky barrier induce charge redistribution within ZnO and reduce oxygen vacancies, enabling ZnO to preferentially nucleate on the Au surface and subsequently evolve into a pyramidal structure. The resulting morphological transformation further enhances electron depletion and plasmonic coupling, lowering the effective plasmonic energy of Au and deepening the SPR red shift. Quantitative analysis based on Mie theory shows that approximately 12% of the free electrons in Au participate in interfacial transfer, confirming the cooperative role of strong electronic coupling in governing both growth dynamics and optical responses. This study provides deeper insight into the photophysical mechanisms of Au–ZnO heteronanocrystals and offers guidance for designing noble metal–semiconductor composites with tunable optoelectronic properties.
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Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 7
·934-943
·
IF 4.532
Xiankun Shao,Benxia Li,Baoshan Zhang,Liangzhi Shao,Yongmeng Wu
Constructing a core–shell nanostructured photocatalyst by integration of plasmonic metal nanocrystals and a semiconductor can offer large active metal/semiconductor interfacial areas and avoid aggregation of the metal nanocrystals. Herein, well-defined Au@ZnO core–shell nanostructures were prepared by coating ZnO on cetyltrimethylammonium bromide (CTAB) stabilized Au nanospheres in aqueous solution. The resultant core–shell nanostructures have Au-nanosphere cores with a diameter of ∼55 nm and ZnO shells with a thickness of ∼50 nm. After calcination at 350 °C in air, the mesoporous ZnO shell with higher crystallinity and a larger surface area was obtained without any significant change in the morphology or plasmon band of Au@ZnO. The specific surface plasmon resonance of the Au-nanosphere cores endows the Au@ZnO nanostructures with strong visible light absorption around 550 nm. The photocatalytic degradation of an organic pollutant was performed under simulated sunlight and monochromatic LED light with three different wavelengths (365 nm, 520 nm, 660 nm), demonstrating the enhanced photocatalysis of the Au@ZnO nanostructures. Furthermore, the Au@ZnO as a photoelectrode material presents a higher photocurrent density than that of pure ZnO nanoparticles under simulated sunlight. The electrochemical impedance spectra (EIS) Nyquist plots also confirm the higher charge transfer efficiency of the Au@ZnO nanostructures. Such plasmonic metal–semiconductor core–shell nanostructures would provide a desirable platform for studying plasmon-induced/enhanced processes and have great potential in light-harvesting applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Zhen Qin,Hang Sun,Yanan Tang,Zhiyong Chang,Shengyan Yin,Zhenning Liu
Inspired by the characteristics that plant leaves are beneficial for solar light absorption, we have prepared a bio-inspired hierarchical assembly of carbonized spinach leaves@Au/ZnO (CS@Au/ZnO) for solar energy utilization. CS@Au/ZnO shows a low light reflectance of 5% and a high specific surface area of 311.41 m 2 /g. CS@Au/ZnO demonstrates higher photocatalytic degradation efficiency: more than 97% of Rhodamine B (RhB) and 61% of ciprofloxacin (CIP) could be degraded in 180 min under the visible light irradiation. In addition, we also tested the photocatalytic H 2 production performance of CS@Au/ZnO and the H 2 evolution rate is 2.384 mmol g −1 h −1 under simulated solar light. CS@Au/ZnO shows a high cycling stability in recyclable photocatalytic degradation and photocatalytic water splitting. Moreover, CS@Au/ZnO shows a swift and steady photocurrent of about 63.6 μA/cm 2 , illustrating a high sensitivity to solar light. The enhanced photocatalysis performance of CS@Au/ZnO could be ascribed to the naturally optimized macroporous structure of CS with high conductivity, which could enhance the light harvesting and carrier transport, simultaneously. Moreover, modification of AuNPs can broaden the light response range of ZnONRs and reduce the probability of electron-hole recombination. Due to the wide availability of plant leaves, CS@Au/ZnO assembly has broad application prospects in photocatalytic degradation of organic pollutions, photovoltaic devices , and photocatalytic H 2 evolution.
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BIOSENSORS & BIOELECTRONICS
·
2020
·
IF 10.257
Tao Liu,Qiang Zhao,Ying Xie,Danfeng Jiang,Zhenyu Chu,Wanqin Jin
Currently, the large-scale and controllable fabrication of nanostructures on substrates remains a great challenge for further practical applications. In this work, a novel 3D aloe-like Au–ZnO nanocomposite was designed for in situ synthesis on an ITO substrate, achieving real-time detection of trace catechol (CC) in water. A seed-assisted hydrothermal approach was proposed to control the crystal distribution and growth direction to build a ZnO aloe-like architecture. To eliminate the natural weak conductivity of ZnO, Au nanoparticles were further deposited on all ZnO arrays to construct Au–ZnO micro/nanostructures. The synergetic effects derived from the aloe-like ZnO with a large specific area and Au nanoparticles with high conductivity resulted in both high electrocatalysis and fast electron transfer in enzymatic reactions . After laccase immobilization , the as-prepared biosensor exhibited specific recognition of catechol among other dihydroxybenzenes and phenol with an ultrahigh sensitivity of 131 μA mM −1 , as well as an extremely wide linear range from 75 nM to 1100 μM and an ultralow detection limit of 25 nM. In addition, in the detection of real lake samples, this biosensor showed satisfactory anti-interference ability and provided reliable assay results.
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Plasmonics
·
2013
·Vol. 8
·期 2
·1193-1202
·
IF 2.425
Han Zhizhong,Wei Liyuan,Zhang Zhankun,Zhang Xinqi,Pan Haibo,Chen Jianzhong
The semiconductor metal oxide, ZnO, is limited to application in photocatalysis because of large bandgap. Metallic nanostructures are utilized to enhance visible-light absorption and improve photocatalytic activity via surface plasmon resonance (SPR). In this work, through a facile thermal decomposition method, the Au nanoparticles (NPs) were successfully loaded on oriented hierarchical ZnO flower-rod (ZFRs) heterostructures, which have a higher areal proportion of exposed active (001) crystal faces. The results indicate that ZFRs are wurtzite phase grown along the [001] direction and the Au NPs spread on the surface of ZFRs in metallic form. It reveals that there is an electronic interaction between Au NPs and ZFRs, and more oxygen molecules are adsorbed on the surface of Au-ZnO flower-rod heterostructures (AZFRs). The AZFRs show a strong absorbance in visible region due to the SPR and enhance the separation of electron–hole pair, resulting in an improvement of photocatalytic activity under visible-light irradiation. During 80 min, the degradation efficiency of rhodamine B for AZFRs-20 is about 3.7 times as the pure ZFRs. Moreover, the AZFRs exhibit predominant photoelectrochemical properties, and the photocurrent can reach 1.2 × 10 −4 A. Finally, the as-prepared photocatalytic device composed of AZFRs based on indium doped tin oxide glass is convenient to recycle without centrifugation.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Zhizhong Han,Min Luo,Li Chen,Jinghua Chen,Chunyan Li
In this work, a novel label free photoelectrochemical (PEC) immunosensor has been developed for the detection of α-fetoprotein (AFP). The immunosensor was based on Au-ZnO flower-rods (FRs) heterostructure, where Au nanoparticles (NPs) were firstly electrodeposited by cyclic voltammetry methods. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Mott-Schottky plot (MS), UV–vis diffuse reflectance spectrum and fluorescence emission spectrum were used for the characterizations of Au-ZnO FRs. The results demonstrated that Au NPs not only obviously enhanced the visible light absorption of ZnO FRs due to surface plasmon resonance (SPR) but also improved the separation of photo-generated electron-hole pairs. Therefore, the photocurrent of Au-ZnO FRs was increased under simulated sunlight. The photocurrent was reduced after the specific antibody-antigen immune reaction. And the photocurrent decrement was linear with the logarithm of AFP antigen concentration in the range from 0.005 ng mL −1 to 50 ng mL −1 with a low detection limit of 0.56 pg mL −1 (S/N = 3). The PEC immunosensor also exhibited high anti-interference property and acceptable stability. This work would provide a promising photoelectrochemical strategy for the detection of other proteins in clinical diagnosis.
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