CRYSTENGCOMM
·
2012
·Vol. 14
·期 19
·6295-6305
·
IF 3.842
Wei Chen,Hong Ruan,Yin Hu,Danzhen Li,Zhixin Chen,Jiangjun Xian,Jing Chen,Xianzhi Fu,Yu Shao,Yi Zheng
We report here a facile one-step strategy to prepare hollow ZnO core/ZnS shell structures by microwave irradiation. The growth mechanism of the hollow core/shell structures was investigated in detail. ZnO truncated hexagonal pyramids first form on as-grown precursor flakes and then evolve into ZnO hexagonal twin crystals, which subsequently grow up and dissolve internally. The hollowing progress is firstly controlled by the Kirkendall effect and then undergoes an Ostwald ripening process. Hollow structures and the formation of ZnO/ZnS heterostructure bring enhanced photocatalytic activities to ZnO core/ZnS shell structures. The formed ZnO/ZnS heterostructures also fill the surface defects of ZnO crystals and improve the stability of the photocatalysts by overcoming the photocorrosion effect of a single ZnO photocatalyst under UV light irradiation. Superoxide radicals (O˙−2) are the key active species in the photocatalytic system of degradation of p-chlorophenol over hollow ZnO core/ZnS shell structures. The photocatalysis process has been discussed and a possible mechanism also has been proposed. This work is helpful to controllably construct other hollow core/shell structures, develop ZnO-based photocatalysts without photocorrosion effect and further study the photocatalytic mechanism of similar systems.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2013
·
IF 2.39
Shaobo Shi,Yu Yang,Jianping Xu,Lan Li,Xiaosong Zhang,Guo-Hua Hu,Zhi-Min Dang
Zn 1− x Co x O (0 ⩽ x ⩽ 0.06) nanorods were fabricated by hydrothermal method. The effect of Co doping on the morphology, crystalline structure, optical and magnetic properties of the samples was investigated. The length of obtained ZnO nanorods increases with the increasing Co concentration. Based on the results of X-ray diffraction and Raman spectra, it is confirmed that a small amount of Co ions are incorporated into ZnO lattice. The segregated phase of Co 3 O 4 was detected at x > 0.01. The absorption and photoluminescence spectra reveal the d–d electronic transitions of tetrahedrally coordinated Co 2+ in ZnO host. Co doping induces fluorescent quenching of the visible emission bands related to surface states and defect states in the Co-doped ZnO nanorods. Weak room temperature ferromagnetism was observed in the samples with x = 0.01 and then paramagnetic characteristics of the samples with x > 0.01.
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CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Aerzigu Xukeer,Jin Li
The ternary nanocomposite ZnO/MnO2/g-C3N4 was synthesized for room-temperature ammonia gas detection. Incorporation of g-C3N4 into the ZnO/MnO2 heterostructure significantly improved the composite’s sensing sensitivity at ambient conditions. g-C3N4 facilitated electron migration across the heterojunction interface, boosting conductivity, and provided abundant adsorption sites for ammonia molecules due to its layered structure. The ZnO/MnO2/g-C3N4 composite material exhibits outstanding ammonia sensing performance, with its detection sensitivity being 2.4 times that of the ZnO/MnO2 system. Notably, this material demonstrates rapid response and recovery characteristics, with recorded times of 7.3 and 1.6 s, respectively, thereby optimizing its functional performance and expanding its range of operational applications. The study found that the optimal doping ratio of ZnO/MnO2/g-C3N4 can effectively enhance the material’s specific surface area and electron mobility, thus improving its ammonia adsorption capacity and optimizing the sensor’s response and recovery characteristics. The synthesis employed a sequential two-step strategy: initial formation of a ZnO/MnO2 heterostructure followed by g-C3N4 integration. This approach effectively mitigated limitations of pure ZnO, including sluggish desorption kinetics and low response magnitude. Density functional theory (DFT) computations were employed to elucidate the atomic-level sensing mechanism, revealing significant charge redistribution at the ZnO/MnO2/g-C3N4 heterojunction interfaces upon ammonia adsorption.
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LANGMUIR
·
2025
·
IF 3.9
Zipo Su,Yangyang Gao,Jialun Li,Liying Wang,Xijia Yang,Yang Gao,Xiaohan Zhang,Wei Lü
Traditional physical and chemical deicing methods are often labor-intensive and inefficient, while superhydrophobic anti-icing coatings provide a simpler and more effective alternative. In this study, a composite coating with a ZnO@CoZIF-8 micronano-structure modified by polydimethylsiloxane (PDMS), polyvinylidene fluoride (PVDF), and 1H,1H,2H,2H-perfluoroalkyltriethoxysilanes (POTS) was prepared via a simple spraying technique. The coating exhibited a contact angle (CA) of 156.6° and a sliding angle (SA) as low as 3.5°. The contact angle remained above 150° for 144 h in an alkaline environment (pH = 11). Due to its excellent superhydrophobic properties, the coating remarkably delayed freezing, extending the complete freezing time of a 20 μL water droplet to 1658 s at −15 °C, which shows a 12-fold increase compared to untreated glass surfaces (120 s). Meanwhile, the coating can maintain low ice adhesion at 44.80 kPa and demonstrates superoleophilicity with an oil–water separation efficiency of 92.69%. It also exhibited notable self-cleaning, antipollution, and antibacterial properties, achieving a sterilization efficiency exceeding 90% after 24 h. The prepared coating shows great potential for applications in wind power, construction, aviation, shipping, and other industries.
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SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Xiaofan Zhai,Peng Ju,Fang Guan,Yadong Ren,Xin Liu,Nan Wang,Yimeng Zhang,Jizhou Duan,Chuanxing Wang,Baorong Hou
Zinc oxide with the morphology of nanopillar is promising marine antifouling materials as they can kill adhered bacteria and fungi. The zinc oxide with the morphology of nanopillar has shown super-antibacterial properties on galvanized steel , which makes ZnO/Zn nanopillar films promising in marine antifouling and antimicrobial corrosion. Thus, an efficient approach to coat ZnO/Zn nanopillar films on steel is of great significance. The electrodeposition method is a universal method for both ZnO crystals and galvanized coatings, and it can control the morphologies and structures of the resultant films. Therefore, in this study, capsaicin was added into an alkaline electrolyte to induce the formation of ZnO nanopillars. Due to capsaicin addition to the electrolyte, ZnO/Zn nanopillar films were obtained in a single cathodic electrodeposition. The added capsaicin in the electrolyte was absorbed on the electrodepositing surface by the functional –NH– groups in amide bond. The Zn(OH) 4 2− diffusion was promoted by negatively shifted electrodepositing potential. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) results illustrate that regular ZnO nanopillars were obtained when the capsaicin concentration was 0.6 g L −1 in the electrolyte. The resultant ZnO/Zn nanopillar films showed high antibacterial properties in Escherichia coli suspended solutions and relatively low living bacterial coverage, indicating promising application in marine antifouling. Electrochemical evaluation revealed that the obtained capsaicin-induced ZnO/Zn nanopillar films exhibited significantly enhanced corrosion resistance in a sulfate-reducing bacteria (SRB) medium. Moreover, the results illustrate that adding 0.6 g L −1 concentration of capsaicin in the electrolyte yielded the best films, which featured the lowest bacterial coverage and highest corrosion resistance.
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PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Beibei Chen,Zhe Dong,Jiaye Li,Mengjie Zhang,Kan Zhang
Hexagonal boron nitride (h-BN) is a promising additive used in tribology ; however, its application is limited due to its poor interfacial combination with polymer matrices induced by its inert and smooth surface. In order to tackle this problem, an innovative ZnO nanowires-decorated h-BN hybrid was first prepared, which was then applied onto epoxy (EP) to enhance its tribological properties. The results demonstrated that ZnO nanowires were in-situ grown uniformly on the exterior of the hydroxylated h-BN, which strengthened the physical and chemical interaction between h-BN and EP, since the EP chains were prone to wrap around the ZnO nanowires. When the h-BN/ZnO content was 0.5 wt%, the friction coefficient and wear rate were decreased by 81.5% and 95.4%, respectively, and the corresponding composite coating possessed superior tribological properties under harsh conditions, which was mainly because of the synergistic reinforcing and lubricating effect between the ZnO nanowires and h-BN, as well as the good interfacial compatibility between h-BN/ZnO hybrid and EP. Moreover, the corresponding enhancement mechanisms of h-BN/ZnO were proposed.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Junhao Cai,Zeng Chen,Shengjun Li,Shaokang Dong,Chaochao Wei,Fumin Li,Yaru Peng,Xiyang Jia,Weifeng Zhang
This study reported the fabrication of hierarchical ZnO NS-NR-structured films by the assembly of ZnO NRs (NRs) on ZnO nanosheets (NSs) by a hydrothermal method . The morphology of the as-prepared ZnO NS-NR films was affected by several factors, such as the TiO 2 intermediate layer, the concentration of Zn(CH 3 COO) 2 in the seed precursor solution, and the hydrothermal reaction time. ZnO NRs were vertically grown on the ZnO NSs under specific conditions. Such ZnO NS-NR films exhibited considerably higher light-scattering ability compared with that of the ZnO NS films. Quantum dot (QD)-sensitized solar cells were assembled using the CdS/CdSe QDs co-sensitized ZnO NS-NR films as the photoanodes. The growth of the ZnO NRs led to the improvement in the short-circuit current density from 12.4 mA cm −2 to 15.1 mA cm −2 . A high power conversion efficiency of 6.0% was obtained with (NH 4 ) 2 TiF 6 treatment for 4 min.
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OPTICS AND LASER TECHNOLOGY
·
2024
·
IF 4.6
Aygul Kadir,Tursun Abdiryim,Xiong Liu,Fangfei Liu,Ruxangul Jamal,Xinsheng Tang,Yaolong Zhang
In the present work, a novel self-powered hybrid ultraviolet (UV) photodetector (PD) based on ZnO @ZnSe nanoarrays/poly(3,4-ethylenedioxyselenophene) (PEDOS) was fabricated and systematically investigated. The designed PD is based on a sandwich configuration and with p-n junction, which is consisting of ZnO as the bottom n- layer, PEDOS as the top of p-layer, and ZnSe as the insertion layer. The results of the study on the performances of UV PD under different conditions optical power density shows that the ZnO@ZnSe/PEDOS exhibits excellent detection of UV light, the device achieves the excellent responsivity (R) 5.44 mA/W and high detectivity (D*) 1.42 × 10 11 Jones under the weaker optical power density (0.32 mW/cm 2 ). The study concludes with a suggestion that the ZnSe layer acts a key role in the superior property of the obtained device, which is introduction of ZnSe layer between the p-PEDOS and n-ZnO layers reduces band migration and thus effectively enhances carrier transport within them, and demonstrating that the responsivity (R) of ZnO@ZnSe/PEDOS is almost 18 times that of the device without the ZnSe layer (0.3 mA/W). On the other hand, as the p- types PEDOS, which enhances the junction quality by reducing the composite center of the carrier, expanding the depletion region and providing a step energy level between the band edges of ZnO and ZnSe, improving the overall collection of photogenerated carriers.
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Nanomaterials
·
2024
·Vol. 14
·期 8
·720
·
IF 4.4
Aygul Kadir,Tursun Abdiryim,Xiong Liu,Ruxangul Jamal,Yaolong Zhang
To solve the problem that zinc oxide nanorods (ZnO NRs)-based self-powered ultraviolet (UV) photodetectors cannot obtain both higher responsiveness and shorter response time, P(EDOS-TTh) was prepared using 3,4-ethylenedioxyselenphene (EDOS) and terthiophene (TTh) as copolymers, which modify the ZnO NRs surface, and the ZnO/P(EDOS-TTh) P-N junction self-powered UV device is assembled. The effect of the number of electrochemical polymerization cycles on the UV photodetection performance of ZnO/P(EDOS-TTh) P-N heterojunction was studied by adjusting the number of electrochemical polymerization cycles at the monomer molar ratio of 1:1. Benefiting from the enhanced built-in electric field of the ZnO/P(EDOS-TTh) interface, balancing photogenerated carriers, and charge separation and transport. The results show that the contact between N-type ZnO NRs and P-type P(EDOS-TTh) is best when the number of polymerization cycles is 3, due to the fact that EDOS-TTh and ZnO NRs form excellent P-N heterojunctions with strong internal electric fields, and the devices show good pyroelectric effect and UV photodetection performance. Under 0 V bias and 0.32 mW/cm2UV irradiation, the responsivity (R) of ZnO/P(EDOS-TTh) reaches 3.31 mA/W, the detectivity (D*) is 7.25 × 1010Jones, and the response time is significantly shortened. The rise time is 0.086 s, which exhibited excellent photoelectric properties and stability. UV photodetection performance with high sensitivity and fast response time is achieved.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Yingkai Liu,Lei Liu,Yujiang Li,Shaoyu Liu,Weibin Zhang,Ruifeng Zhang,Yao Liu,Qian Rong,Jie Zheng
The regularly ordered core–shell nanorods provide an effective transport channel for the adsorption and desorption of the target molecules. However, it remains a great challenge to precisely control the shell thickness of the ordered core–shell nanorods and improve the catalytic activity of their surfaces due to the complexity of the reaction system, especially by enhancing their selectivity to short-chain alcohols. Herein, we propose ZnO/TiO2 core–shell nanorod arrays (NRs) with different shell thicknesses prepared by electron beam evaporation and found that they possess advanced selectivity for short-chain alcohols. The response time of a ZnO/TiO2 core–shell NR with a TiO2 shell of 30 nm to 100 ppm isoamyl alcohol is 17 s. Its response to 100 ppm of isoamyl alcohol is 807, which is approximately 158 times that of the pure ZnO NR. The ZnO/TiO2 NR (30 nm) sensor exhibited excellent selectivity for methanol, ethanol, isopropanol, n-butanol, and isoamyl alcohol. The response to alcohols increased with the increase of the alcohols’ chain length. Its sensing mechanism for short-chain alcohols is explained in terms of adsorption energy, acidity, and electronegativity of H in organic groups by density functional theory in detail. Our results open an alternative route for the design of sensitive materials for the selective detection of short-chain alcohols.
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DALTON TRANSACTIONS
·
2024
·
IF 3.5
Guandong Wang,Yizhi Yin,chenfeng Lin,Shixiong Min,Jinfu Ma
In pursuit of highly active zinc-air battery (ZAB) catalysts, nitrogen doping has proven key to enhancing carbon-based non-metallic catalysts' performance in the oxygen reduction reaction (ORR). This study employed a novel method to synthesize variously sized ZnO materials coated with ZIF-8. Notably, smaller particle sizes correlated with reduced activation energy. ZnO-12, the smallest variant, fully carbonized at 800°C, resulting in zinc ion evaporation and the formation of an amorphous carbon nano-hollow structure, ZIF8/ZnO-12. This material showcased remarkable ORR properties, with an onset potential of 0.9 V (vs. RHE) and a Tafel slope of 71.4 mV dec-1, surpassing the benchmark Pt/C catalyst and exhibiting excellent stability. Moreover, in ZAB tests, ZIF8/ZnO-12 achieved a specific capacity of 816 mAh g-1, outperforming Pt/C. DFT calculations indicate that under alkaline conditions, nitrogen-doped carbon materials containing adsorbed oxygen and doped oxygen exhibit lower catalytic activation energy for the ORR, which is beneficial for accelerating the ORR. This research provides valuable insights into designing more efficient carbon-based non-metallic catalysts for ZABs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yan-nan Wang,Zhijia Liao,Jin Li,Fanli Meng
This study presents a room temperature triethylamine (TEA) gas sensor based on the macro-bend fiber. The sensor achieves the rapid and high sensitivity measurement of TEA gas by coating the bending section of the optical fiber with ZnOHF-ZnO nanomaterial . The macro-bend fiber structure increases the penetration depth of the evanescent field transmitting along the no-core optical fiber (NCF), what allowing more light to leak into layer of the gas-sensitive material and thus enhancing the sensitivity to TEA gas. Different sensing probes were fabricated and compared for the coating layers with ZnOHF and ZnOHF-ZnO, respectively. The results showed that the sensitivity of the ZnOHF-ZnO coated sensor was 0.0044 dB/ppm, which was three times higher than that of the ZnOHF-coated sensor. Other sensing performance was experimentally demonstrated with a limit of detection (LOD) of 1 ppm, a response time of 16 s, and a recovery time of 18 s, enabling fast detection for TEA gas. Finally, the working mechanism has been explained. This macro-bend fiber-based TEA gas sensor has the advantages of small size, low operating temperature, fast response time, and good selectivity, making it suitable for the rapid identification and detection of TEA gas.
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