ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Jing Lei,Wei Liu,Yan Jin,Baoxin Li
Defect engineering is an effective strategy to improve the catalytic activity of metal oxides, and quantitative characterization of surface defects is thus vital to the understanding and application of metal oxide catalysts. Herein, we found that ZnO nanoparticles with oxygen vacancy could trigger the luminol–H2O2 system to emit a strong chemiluminescence (CL), and the CL intensity was strongly dependent on the oxygen vacancy of the ZnO nanoparticles. The mechanism of this CL reaction was discussed by means of the electron-spin resonance spectrum, X-ray photoelectron spectrum (XPS), and CL spectrum. The oxygen vacancy-dependent CL was attributed to the ability of the oxygen vacancy to readily adsorb and further dissociate H2O2 into active •OH radicals. Taking advantage of this oxygen vacancy-dependent CL, we presented one method for quantifying the oxygen defects in ZnO. Compared with the current evaluation techniques (XPS and Raman spectroscopy), this CL method is rapid, low-cost, and easy to operate. This work introduces the CL technique into the field of material structure–property evaluation, and provides a new approach for exploring the defect function in ZnO defect engineering.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2025
·
IF 12.1
Zhenhua Ge,Shengyi Yang,Zhenheng Zhang,Mingdong Hong,Mingzhu Liu,Ayesha Zia,Yurong Jiang,Bingsuo Zou,Libin Tang
High-sensitivity infrared photodetectors have attracted attention due to their broad applications. Photomultiplication is an ideal choice for high-sensitivity photodetectors since it can generate large photogenerated current under incident faint illumination, making them more user-friendly and cost-effective without any extra amplifier circuits. In this work, 2 wt.% acetic acid in methanol is optimized to treat the electron-accumulated ZnO layer in photodetector ITO/ZnO/PbS/Ag by increasing its interfacial oxygen vacancies, thus the interfacial band bends at the ZnO/PbS interface due to the accumulated charges under illumination. In this way, a high-gain photomultiplication-type photodetector ITO/ZnO/PbS/Ag, in which PbS colloidal quantum dots (CQDs) act as the active layer, is presented. As a result, a high responsivity of 524 A/W with a high external quantum efficiency of 66516% is achieved from the photodetector ITO/ZnO/PbS/Ag under 0.2 µW cm −2 980 nm illumination at -1 V. Further, a low turn-on voltage of 2 V is obtained from the upconverters ITO/ZnO/PbS(240 nm)/TAPC(50 nm)/CBP:Ir(ppy) 3 (60 nm)/BCP(20 nm)/LiF(1nm)/Al under 1.637 mW cm −2 980 nm illumination, exhibiting a photon-to-photon conversion efficiency of 11.08%. In addition, upconversion imaging through a single-pixel device and a 16 × 16 display array is demonstrated, implying its potential scalable applications. Therefore, it provides a promising and applicable pathway for high-performance upconverters.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2012
·Vol. 95
·期 7
·2322-2329
·
IF 2.272
Wei Chen,Dandan Yu,Hong Ruan,Danzhen Li,Yin Hu,Yibin Chen,Yunhui He,Xianzhi Fu,Yu Shao
To controllably construct ZnO-base heterostructures, unique ZnO hexagonal quasi-hourglasses have been synthesized by a microwave-assisted hydrothermal approach. The phase purity and the morphologies of as-prepared samples have been determined by using X-ray powder diffractometer, field-emission scanning electron microscopy and transmission electron microscopy. We have rationally discussed the growth and reaction mechanism and revealed the morphological evolution of ZnO hexagonal quasi-hourglasses. Dodecylamine, as well as the initial concentration of zinc source, the reaction temperature and time, play an important part in the synthesis of ZnO hexagonal quasi-hourglasses. Between ZnO and Zn 5 (OH) 8 (NO 3 ) 2 , a reversible reaction seldom reported occurs in a circular manner as the reaction proceeds continuously. The presence of ZnO multipods in the products and the controllable synthesis of half of ZnO hexagonal quasi-hourglass betoken a possibility to synthesize ZnO hierarchical architectures, even ZnO-base heterostructures by using this kind of ZnO building blocks.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2016
·
IF 3.685
Xiaodong Ren,Wenping Dang,Qiang Ma,Xuejie Zhu,Wei Zi,Lujian Jia,Bin Liu,Xisheng Zhang,Fengwei Xiao,Heqing Yang,Zhou Yang,Shengzhong (Frank) Liu
Superior texture-controlled ZnO thin film is prepared using a low cost electrochemical deposition process at open atmospheric condition. FE-SEM shows that the surface morphology can be altered from nanorods to microplates by adding a chemical additive. XRD analysis confirms that the crystalline growth direction and texture can be controlled by changing the additive concentration during the deposition. Using the optimized ZnO based back reflector (BR) in single junction a-SiGe:H solar cell device, we have achieved external quantum efficiency (EQE) as high as 87% at ∼550 nm; the EQE corrected short circuit current density ( J SC ) was 20.63 mA cm −2 and solar cell efficiency was 7.73% for the single junction a-SiGe:H solar cell. It proves to us that the high quality ZnO thin films can be produced at much reduced cost using electrochemical deposition for solar cell and other optoelectronic applications.
研究领域:
材料科学
·
能源技术
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Anting Kong,Xin Ren,Xuejun Ruan,Meilian Zhong,Xuebin Lao,Haibo Jiang,Zheng Yao,Liyi Shi
The effects of the dispersant and the inorganic high resistance coating on the microstructure and the electrical properties of the ZnO varistors , especially on the current withstand capacity, were studied. The results showed that under the premise of adequate slurry dispersion, when the dispersant content was the minimum, the porosity of the varistor was the minimum, and the current withstand capacity was up to 24 A/cm 2 in 2 ms square waveform impulse test. By coating a high resistance layer with high proportion of spinel forming elements, the content of spinel near the side of the varistor ceramic was increased, thus increasing the resistivity and alleviating the current impact near the edge. The current withstand capacity of 2 ms square waveform impulse was upgraded to 32 A/cm 2 .
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 31
·期 11
·115502
·
IF 3.399
Shendan Zhang,Chenhao Wang,Fengdong Qu,Siqi Liu,Cheng-Te Lin,Shiyu Du,Yousi Chen,Fanli Meng,Minghui Yang
Surface modification is a simple and effective means to promote the sensing performance of metal oxide semiconductor-based gas sensors. Marigold-shaped ZnO nanoflowers are fabricated via a simple precipitation reaction and subsequently catalytically modified with RuO2 on the surface through an ethylene glycol solvothermal treatment. The experimental results have proven that a very low content of Ru on the surface of ZnO exists in an oxidized state. However, the gas response of the sensor based on RuO2-modified ZnO is remarkably improved by 17 times to 100 ppm acetone with the decrease of optimal operating temperature from 219 °C–172 °C and reduction in recovery time from 79–52 s. The sensing enhancement mechanism of surface modification can be attributed to the formation of massive small heterostructure between p-type RuO2 ultrasmall nanoparticles and n-type ZnO as well as the catalytic effect of Ru4+ and a rougher surface.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Yanning Qu,Renliang Huang,Wei Qi,Mingbo Shi,Rongxin Su,Zhimin He
Zinc oxide (ZnO) nanomaterials are functional photocatalysts that show excellent photocatalytic activity, among which diverse morphologies, such as nanospheres, nanorods, nanoleaves, nanodisks, or nanoflowers, often possess different photocatalytic activities. In this study, we employed a simple ultrasonic treatment to controllably synthesize three types of three-dimensional (3D) fluffy ZnO nanoflowers with different nanostructures. Specifically, one nanoflower with smooth edges was formed via direct hydrothermal reaction without ultrasonic treatment (denoted as ZnO-0), and the other two with different jagged margins were obtained by ultrasonic treatment at 250 W and 950 W, respectively, before the hydrothermal procedure (denoted as ZnO-250 and ZnO-950). The results showed that the size, specific surface area, crystallite dimension, intrinsic donor defects and the signals of reactive radicals of ZnO nanoflowers all decreased with increasing ultrasonic intensity. Furthermore, the photocatalytic performance of such ZnO nanoflowers with similar morphologies but different nanostructures was investigated using methyl orange (MO) as a model pollutant. As expected, ZnO-0 possessed the highest photocatalytic activity with a kinetic constant of 0.0478 min −1 , while the value decreased to 0.0251 min −1 and 0.013 min −1 for ZnO-250 and ZnO-950 under simulated sunlight irradiation, respectively, suggesting that the photocatalytic efficiency of ZnO nanoflowers decreased due to the ultrasonic treatment. These findings provide structural insight into the photocatalytic activity of ZnO nanoflowers.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Mingchao Cao,Shiteng Liu,Shusheng Liu,Zhaogang Tong,Xijun Wang,Xinhua Xu
In this study, monolayer titanium carbide (Ti 3 C 2 T x ) material was prepared, then the modified ZnO and Ti 3 C 2 T x were self-assembled to obtain the MXene based composite material. Finally, ZnO/Ti 3 C 2 T x /Nafion/Au electrodes were prepared to construct a dopamine electrochemical sensor for detection of dopamine. SEM, XRD measurements and so on verified the synthesis of monolayer Ti 3 C 2 T x and preparation of the MXene based composite material. Utilizing Chronoamperometry (I-t), we found the electrodes displayed a linear dynamic range from 0.1 to 1200 μM with a limit of detection of 0.076 μM (S/N = 3). Meanwhile, the sensitivity of the sensor is 96nA/μM and in the prepared biological samples, the recoveries of the sensor were 97.8%∼102.2%. Finally, the electrochemical sensor showed a good reproducibility and stability.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2022
·Vol. 8
·期 9
·e202200243
·
IF 3.82
Xueyang Wang,Fanshu Yuan,Dan Xue,Jie Liu,Jie Wei,Yiwen Wang,Jiahui Wang,Qinghua Qu,Qianli Zhang
Graphical A binder-free electrode was constructed by decorating MnO 2 nanoflowers onto the hybrid material of ZIF-8/ZnO, as derived from ZIF-8 via pyrolysis. Both the composite electrode and the NF/ZIF-8-ZnO/MnO 2 //activated carbon (AC) asymmetric supercapacitor demonstrate excellent electrochemical performance, showing that NF/ZIF-8-ZnO/MnO 2 is a promising candidate for supercapacitors due to the synergistic contribution of ZIF-8, ZnO and MnO 2 . In this study, ZIF-8 (Zn(MeIn) 2 , MeIn=2-methylimidazole) was synthesized directly on Ni foam with the use of polydopamine (PDA). By following a hydrothermal process, MnO 2 nanoflowers were decorated on the hybrid material of ZIF-8/ZnO, as derived from ZIF-8 via pyrolysis at 500 °C under nitrogen flow. The produced binder-free electrode (NF/ZIF-8-ZnO/MnO 2 ) demonstrated an excellent electrochemical performance for supercapacitors, including a specific capacitance of 2005 F g −1 at 2 A g −1 and a fairly high cycling stability (90.74% retention after 4000 cycles). Furthermore, a NF/ZIF-8-ZnO/MnO 2 //activated carbon (AC) asymmetric supercapacitor showed an energy density of 70.57 Wh kg −1 given a power density of 112.45 kW kg −1 . These results demonstrate that NF/ZIF-8-ZnO/MnO 2 is a promising candidate for supercapacitors due to the synergistic contribution of ZIF-8, ZnO and MnO 2 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Yanyan Peng,Dayong Jiang,Man Zhao,Mingyang Li,Haoda Li,Siyuan Li
Hybrid heterojunction photodetectors (PDs) have received widespread attention due to their excellent optoelectronic performance. This study investigated the combination of ZnO with organic–inorganic perovskites to develop a high-performance heterojunction hybrid PD. The developed PD showed optical responses of 0.70 and 0.86 A/W at 350 and 850 nm. The detectivity achieved values of 3.98 × 1011 and 4.92 × 1011 Jones, while the external quantum efficiency stood at 246.59 and 125.31%. In addition, the PD displays broad-band responsivity to illumination ranging from ultraviolet to near-infrared light. Incorporating [6,6]-phenyl-C61 butyric acid (PCBM) into the perovskite film to form a bulk heterojunction further enhances the responsivity, detectivity, and photoconductivity gain. This enhancement is attributed to the improved separation of electron–hole pairs, resulting in optical responses of 3.55 and 3.94 A/W at 350 and 850 nm, respectively. Moreover, detectivity was measured with values of 3.64 × 1012 Jones and 4.04 × 1012 Jones, with external quantum efficiencies of 1258.88% and 574.82%.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jian Ding,Shuqun Chen,Ning Han,Yi Shi,Peng Hu,Hongyi Li,Jinshu Wang
Gas response control through structural and defect engineering in metal oxides are critical approaches to realize high performance sensors. Herein, we present the fabrication of ZnO thin films containing nanosized structures and high concentration of zinc interstitials for NO 2 and ethanol monitoring. The target materials were fabricated by aerosol assisted chemical vapour deposition (AACVD) method on ceramic and glass substrates, and were characterized by complementary analytical techniques. The obtained ZnO nanoparticulate and nanopyramidal thin films yielded an outstanding response of ~41 to 1 ppm NO 2 and ~236 towards 100 ppm ethanol, respectively. The reasons accounting for such an enhancement were revealed by the surface-depletion model in ZnO and the chemisorption energies of oxygen molecules on Zn i -enriched crystal facets.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Bing Xue,Yingquan Zou
Herein, a ZnO-graphene nanocomposite photocatalyst was obtained by a facile one-step photochemical method . Both the reduction of graphene oxide (GO) and uniform loading of ZnO nanoparticles (NPs) on the surface of graphene were achieved during the photochemical reaction process using GO as the precursor of graphene and zinc chloride (ZnCl 2 ) as the single source of ZnO. The products were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and ultraviolet–visible spectroscopy. The photocatalytic activity of ZnO/rGO composites was studied by the photodegradation of methylene blue (MB) dye. The as-prepared ZnO/rGO photocatalyst possesses great adsorptivity of dyes (e.g., MB) and high charge separation properties. After receiving the photoelectrons from ZnO, graphene plane can effectively transfer the photoelectrons, thereby showing highly efficient photocatalytic degradation towards pollutants. The effective introduction of rGO significantly improved the photocatalysis and sensing properties of ZnO, and we believe that the as-prepared ZnO/rGO nanocomposite would be promising for practical applications in future nanotechnology.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）