SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Rushun Xue,Lingmin Yu,Man Gong,Chuantao Zhang,Senlin Li,Shanglin Yang,Xuefeng Xiao,Ning Nan,Chun Li,Xinhui Fan
CuO is a typical p-type semiconductor with the advantage of narrow bandgap, making it a gas sensing material for detecting CO gas at lower operating temperatures.However, the poor response value limits its application. As a classical wide-band gap n-type gas sensing metal oxide semiconductor, TiO 2 has the advantages of high response to CO. However, high operating temperature becomes the big obstacle to overcome. Therefore, sensitive CO detection at lower temperature will be achieved by integration of CuO with TiO 2 . In this paper, in-situ two step hydrothermal method was used to prepare CuO/TiO 2 vertical bilayer nanorod arrays grown in situ. The gas sensing results show that the response value of the CuO/TiO 2 vertical bilayer nanorod arrays is 6.1 times (14.9, 300 ppm) higher than that of single CuO nanotentacle arrays (2.1, 300 ppm), and the operating temperature is reduced to 100 °C compared with pure TiO 2 nanorod arrays (360 °C). This strategy provides a new idea for the fabrication of CO gas sensors with high response and low operating temperature.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Chuanqi Pan,Huan Shen,Guoli Liu,Xiang Zhang,Xiaoxuan Liu,Huifeng Liu,Peiyan Xu,Wei Chen,Yuan Tian,Hongtao Deng,Hongwei Sun,Jinlong Wang,Zhu Luo,Lizhi Zhang,Yanbing Guo
Bacterial infection can induce a variety of deadly diseases that seriously threaten human life and health. TiO2 is extensively employed as a broad-spectrum antibacterial photocatalytic material for the inactivation of bacteria. However, a wide-band-gap nature has limited the effectiveness of TiO2 to only the UV-light range. In addition, photogenerated electrons and holes can recombine quickly, inducing low antibacterial efficiency. Here, we fabricated a CuO/TiO2 nanobelt by an impregnation method and introduced surface oxygen vacancies (Ov) to significantly improve their photocatalytic inactivation performance against Staphylococcus aureus. The CuO/TiO2–H2 catalyst contains more Ov and exhibits excellent antibacterial properties against S. aureus. The antibacterial efficiency is 32.2 and 99.4 times those of CuO/TiO2 and bare TiO2, respectively, under light irradiation. The photogenerated electron–hole pairs react with molecular oxygen (O2) and a surface hydroxyl group or water (OH– or H2O), resulting in the formation of an active hydroxyl radical (·OH) and a superoxide radical anion (·O2–). In addition, the surface Ov can effectively reduce the conduction band and act as an electron capture center, thereby promoting the adsorption and activation of O2 and generating more active ·O2– species. This work indicates the efficient antibacterial activity of a CuO/TiO2 nanobelt with Ov and provides a feasible approach for the development of highly efficient antibacterial nanomaterials in the medical field.
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Benxia Li,Yonggan Hao,Baoshan Zhang,Xiankun Shao,Luyang Hu
Exploiting photocatalysts/catalysts with characteristics of low cost, high reactivity and easy recovery is of great significance for energy efficiency and environmental remediation. Herein, CuO/TiO 2 hybrid nanofibers with different CuO contents were fabricated by a simple and low-cost method of electrospinning followed with calcinations in air. The hybrid nanofibers possess some distinct merits including mesoporous structure, extended light response range, and large TiO 2 /CuO interface. The CuO/TiO 2 hybrid nanofibers showed improved photocatalytic activity for organic dye degradation under both simulated sunlight (UV–vis) and visible light (λ > 420 nm), compared with pure TiO 2 nanofibers. Both processes exhibited humplike activity dependence upon CuO addition, with a peak at 1 wt.%-CuO content under UV–vis light and a peak at 5 wt.%-CuO content under visible light, respectively. The mechanism for the CuO-content dependent photocatalysis was discussed with the photoelectrochemical analysis in evidence. Moreover, the CuO/TiO 2 hybrid nanofibers exhibited very high catalytic efficiency for the reduction of nitrophenols by sodium borohydride, and the apparent reaction rate constants ascended with the increased CuO content. The optimized CuO/TiO 2 nanofibers are expected to act a highly efficient catalyst to replace the noble metals in this field. Therefore, this work demonstrated a convenient case for the exploitation of noble-metal-free catalysts with high efficiency, to meet the increasing demands of industrial applications at reduced costs.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Renjie Xie,Jianbin Lu,Jian Wang
The detection of dissolved gases in the oil of oil-immersed transformers is essential to evaluate the operating status of oil-immersed transformers. In this study, a CuO/TiO 2 /N-MWCNTs composites-based sensor was fabricated by hydrothermal method for the detection of dissolved CO gas in oil. The introduction of N-MWCNTs with high specific surface area, high electrical conductivity and multiple adsorption sites effectively improved the response value and response/recovery performance for CO. The response can reach 4.33 at a CO concentration of 50 ppm, which is 1.74 times higher than that of the CuO/TiO 2 sensor. In addition, the prepared sensor presents a fast response/recovery time (230 s/60 s) to CO, and has excellent selectivity and long-term stability. Finally, a multi-concentration CO alarm system was constructed through a reasonable circuit design. It is shown that the CuO/TiO 2 /N-MWCNTs-based sensor can achieve high-precision CO detection, which can provide a new idea for the detection of dissolved CO gas in the oil of oil-immersed transformers.
研究领域:
材料科学
·
传感器技术
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Jialin Liang,Fang Yuan,Ting Liu,Chenguang Qian,Zhangshuo Song,Lijuan Wei,Chunquan Li,Zhiming Sun
Photothermal catalytic oxidation is a promising and sustainable method for the degradation of indoor formaldehyde (HCHO). However, the excessively high surface temperature of existing photothermal catalysts during catalysis hinders the effective adsorption and degradation of formaldehyde under static conditions. Catalyst loading and oxygen vacancies (OVs) modulation are commonly employed strategies to reduce the photothermal catalytic temperature and enhance the efficiency of photothermal catalytic oxidation. In this work, a p-n type CuO/TiO 2 heterojunction is successfully loaded onto diatomite using a wet precipitation method. Under the irradiation of a 300W xenon lamp, the prepared composite material achieved a 100% removal rate of HCHO within 2 h, with a 98% conversion rate to CO 2 , surpassing the performance of both individual photocatalysts and thermocatalysts. Additionally, by adjusting conditions such as light irradiation and temperature, we have demonstrated that this material exhibits synergistic photothermal catalytic properties. Based on HRTEM, XPS, Raman, and EPR analyses, the introduction of diatomite as a catalyst support was shown to effectively increase the number of OVs. Experimental results, along with O 2 -TPD, photoelectrochemical characterization, and radical detection, demonstrate that the presence of OVs enhances the oxidative efficiency of both photocatalysis and thermocatalysis, as well as the UV–Vis-IR photothermal catalytic performance. The ternary composite material generates weak hydroxyl ( • OH) and superoxide ( • O 2 − ) radical under high-temperature with dark conditions, indicating its catalytic oxidation activity under this condition. The increase in temperature and the expansion of the spectral range both enhance the generation of these radicals. In summary, this work demonstrates that the use of diatomite as a support increases the material's specific surface area and OVs content, thereby enhancing adsorption and photothermal catalysis. It elucidates the enhanced catalytic degradation mechanism of this mineral-based photothermal catalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xike Tian,Lin Liu,Yong Li,Chao Yang,Zhaoxin Zhou,Yulun Nie,Yanxin Wang
Detection of pesticides in ground water has become a very important and crucial research area due to the rapid expansion of agriculture and stringent environmental protection acts. In this paper, the as-prepared CuO-TiO 2 hybrid nanocomposites were decorated on the glass carbon electrode as the nonenzymatic electrochemical nanosensor for the sensitive and selective detection of methyl parathion. The electrochemical behavior of the modified electrode was investigated by cyclic voltammetry, showing that the modified electrode can be used for methyl parathion detection. Differential pulse voltammetry was applied to evaluate methyl parathion detection ability under optimized experimental conditions, and found the modified electrode can detect methyl parathion sensitively in a wide dynamic detection range from 0 ppb to 2000 ppb with a lower limit of detection (LOD) of 1.21 ppb. In addition, other interfering materials have no any influences on the detection of methyl parathion. Furthermore, the modified electrode has also been used for methyl parathion detection in the actual ground water samples, and showed efficient sensing ability. The electrochemical sensor developed would have great potentiality for methyl parathion sensing and provide new insights into the detection of other organophosphorous pesticides in the ground water.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 2
·1269-1279
·
IF 2.019
Hu Liang,Xia Yuting,Wang Qianqian,Yang Hui,Zhang Qi-long
In this work, a core–shell dendritic CuO@TiO 2 was constructed through a two-step chemical method. Structural analysis confirms the successful coating of TiO 2 on the CuO and the dendritic morphology was maintained after the coating process. The composites were prepared by using ferroelectric P(VDF-HFP) as matrix and synthesized particles as filler. The introduction of fillers influences the melting and crystallization process of the polymer matrix without altering the composition. The insulator layer suppresses the conductivity and dielectric loss by blocking the charge carriers while the composites exhibit improved dielectric constant in the frequency wide range of 10 2 –10 6 Hz and enhanced thermal conductivity. The composite with 20% CuO@TiO 2 exhibits a high dielectric constant of 51.7, low loss of 0.11 at 1 kHz and high thermal conductivity of 0.382 W/mK, showing huge potential for dielectric applications.
研究领域:
材料科学
·
电气工程
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 18
·4252
·
IF 3.2
Shouzhen Duan,Wanjun Zhang,Xiaoyan Wang,Youqing Zhao,Hui Nan,Guijun Yang
This research was designed to improve the separation efficiency of photogenerated carriers in TiO2through the construction of a PN heterojunction. The motivation behind this was to tackle the problems of the narrow light response range and the high electron-hole recombination rate of TiO2. By simple one-step implementing electrospinning and calcination procedures, CuO/TiO2PN heterojunction nanofibers were successfully synthesized. XRD and SEM analyses confirm that the heterojunction is a nanofiber structure composed of TiO2and CuO, with the TiO2containing anatase and rutile phases. The PL reveals that the fluorescence intensity of the heterojunction is lower compared to that of pure TiO2, and this implies a remarkable enhancement in the carrier separation efficiency. Under xenon light irradiation, for the optimized sample, the degradation rate of RhB exceeds 80%. This degradation rate is 68% higher than that of pure TiO2. The improvement in photocatalytic performance can be ascribed to the efficient charge separation driven by the built-in electric field within the PN junction and the extended light absorption range. The photoelectrochemical test further verified that the photocurrent density of the heterojunction system was 52.42% higher than that of the single TiO2, providing a new strategy for designing efficient photocatalytic systems.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境功能材料
·
半导体异质结
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2023
·Vol. 70
·期 4
·848-856
·
IF 1.8
Xiqiang Tian,Yanping Dong,Muhammad Zahid
The excellent photocatalytic hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with NaBH 4 in the aqueous medium is still a big challenge. Herein, we report a facile one-pot evaporation-induced self-assembly (EISA) method to synthesize a series of CuO/TiO 2 nanocomposites. The as-synthesized CuO/TiO 2 photocatalysts exhibit remarkable catalytic activity under direct sunlight in selective hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) due to the synergistic interaction of guest copper nanoparticles with host titanium dioxide (TiO 2 ) species. Especially, 5 wt% CuO/TiO 2 nanocomposite revealed superior reaction rate constant (k) value (0.306 min −1 ) when compared to 3 wt% CuO/TiO 2 (0.192 min −1 ) and 7 wt% CuO/TiO 2 (0.240 min −1 ). Moreover, several characterization techniques (XRD, TEM, N 2 adsorption–desorption isotherm, DRS, and XPS) were executed to deeply investigate the effect of copper content on the bulk and interfacial properties of the catalysts. The characterization results proved that the superior photocatalytic hydrogenation over 5 wt% CuO/TiO 2 catalyst can be ascribed to moderate CuO loading as well as even dispersion of CuO species on the surface of active TiO 2 host, which can largely improve the light absorption ability within visible light region. Besides, the 5 wt% CuO/TiO 2 catalyst exhibits remarkable recyclability and durability, retaining its superior activity (above 95%) up to several repeating cycles, proving its practical applicability for hydrogenation reactions at domestic and industrial levels.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2025
·
IF 3.9
Aijia Sun,Yang Zhao,Jiamu Li,Han Lai,Huayi Li,Zhengchun Yang,Jie He,Peng Pan,Rui Zhang
Plastic pollution represents a significant global environmental challenge requiring advanced mitigation strategies. This investigation systematically examines the photocatalytic degradation performance of CuO/TiO 2 composites to prove the feasibility of rapid degradation of polyethylene terephthalate (PET). Various advanced characterization methodologies, including Scanning Electron Microscopy (SEM), X-ray Diffractometry (XRD), and X-ray Photoelectron Spectroscopy (XPS), were employed to verify the successful synthesis of nanocomposites and elucidate their distinctive structural attributes and superior photocatalytic functionality. Implementation of a two-step photocatalytic degradation protocol enabled PET to achieve remarkable mass reduction of 97.39 ± 0.79 % after 2 h illumination, representing approximately 30-fold enhancement compared to untreated PET samples. Furthermore, the use of PET film as a pollutant verified the practical feasibility of this method, highlighting the potential of CuO/TiO 2 composites for plastic degradation. Complementary free radical quenching experiments and electron paramagnetic resonance (EPR) spectroscopic analyses identified hydroxyl radicals (•OH) as the predominant active species governing PET decomposition pathways. The proposed mechanistic model elucidates the synergistic effects of interfacial energy band modifications between constituent semiconductor components, which critically enhance photoinduced charge carrier separation efficiency. Notably, the study not only achieved the efficient degradation of PET but also provided an efficient method for solving environmental plastic pollution in the future.
研究领域:
环境科学
·
材料工程
·
纳米技术
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Wei Wu,Jingyu Long,Yuanjun Guo,Xiaotao Zu,Sean Li,Xia Xiang
A surface acoustic wave (SAW) H 2 S gas sensor based on CuO-TiO 2 p-n heterojunction film was designed and fabricated. The sensor exhibits high sensitivity to H 2 S due to the significant current response of CuO-TiO 2 film to H 2 S gas and the appropriate work point of SAW sensor based on CuO-TiO 2 composite film. The linearity change for sensor frequency shift is strongly associated with the location of work point when the H 2 S concentration increases from 1 to 300 ppm. In addition, the porosity of CuO-TiO 2 film is beneficial to the efficient adsorption for H 2 S, leading to the higher frequency shift of the sensor. The SAW sensor also shows good selectivity and stability to H 2 S with stable frequency shift under different humidity levels.
研究领域:
材料科学
·
传感器技术
·
气体检测
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xiao Wang,Yang Li,Zhiying Li,Shouwei Zhang,Xiaolong Deng,Gang Zhao,Xijin Xu
Considering the poor sensing abilities and high working temperatures for trace triethylamine (TEA) detection, design and fabrication of TEA gas sensors with high sensitivity and low power consumption are still desired. Decorating p-type substrate with n-type semiconductor to form p-n junction is considered to be an effective approach to enhance their sensing abilities. Herein, regular "droplets on salix leaf" like CuO/TiO 2 nanocomposites were designed and successfully synthesized using a two-step method including a water bath treatment and a TiF 4 solution etching process. Surface characterizations indicated that the CuO substrate exhibited a salix leaf like nanosheets structure with massive TiO 2 nanoparticles (about 11 nm) decorated on its surface. Excitingly, gas sensing results showed that the CuO/TiO 2 sensors exhibited a high sensing response of 12.7–5 ppm TEA at a low working temperature (160 °C) and possessed a low detection limit (0.5 ppm). The sensing mechanism was also proposed and attributed to the massive highly dispersed p-n junctions between CuO and TiO 2 nanoparticles, which could significantly change the electrical conductivity and oxygen adsorption abilities. In addition, X-ray photoelectron spectroscopy and Electron paramagnetic resonance measurements confirmed the existence of large amounts of surface oxygen vacancy regions and chemisorbed and dissociated oxygen species, which were beneficial to their gas sensing abilities. This work provides a new strategy to fabricate highly sensitive trace TEA gas sensing materials with low working temperatures, which will also promote the application of p-type gas sensors.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）