Nanomaterials
·
2023
·Vol. 13
·期 16
·2289
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IF 5.3
Zhenyu Wang,Haizhen Ding,Xuefeng Liu,Jing Zhao
Semiconductor oxide gas sensors have important applications in environmental protection, domestic health, and other fields. Research has shown that designing the morphology of sensitive materials can effectively improve the sensing characteristics of sensors. In this paper, by controlling the solvothermal reaction time, a unique hexagonal flower-like structure of In2O3materials consisting of cuboid nanorods with a side length of 100–300 nm was prepared. The characterization results indicated that with the increase in reaction time, the materials exhibited significant morphological evolution. When the solvent heating time is 5 h, the flower-like structure is basically composed of hexagonal nanosheets with a thickness of several hundred nanometers and a side length of several micrometers. With the increase in reaction time, the apex angles of the nano sheets gradually become obtuse, and, finally, with the Ostwald ripening process, they become cuboid nanorods with side lengths of 100–300 nanometers, forming unique micro-flowers. Among them, the material prepared with a reaction time of 20 h has good sensing performance for NO2, exhibiting low operating temperature and detection limit, good selectivity, repeatability, and long-term stability, thus suggesting a good application prospect.Keywords:In2O3;micro-flowers;morphological evolution;NO2sensor;solvothermal
研究领域:
材料科学
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环境科学
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化学传感器
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Wei Liu,Ding Gu,Xiaogan Li
A novel chemiresistive-type sensor for detecting sub-ppm NO2 has been fabricated using AuPt bimetal-decorated SnSe2 microflowers, which was synthesized by the hydrothermal treatment followed by in situ chemical reduction of the bimetal precursors on the surface of the petals of the microflowers. The as-prepared sensor registers a superior performance in detection of sub-ppm concentration of NO2. Functionalized by the AuPt bimetal, the SnSe2 microflower-based sensor shows a response of approximately 4.62 to 8 ppm NO2 at 130 °C. It is significantly higher than those of the sensors using the pristine SnSe2 (∼2.29) and the modified SnSe2 samples by a single metal, either Au (∼3.03) or Pt (∼3.97). The sensor demonstrates excellent long-term stability, signal repeatability, and selectivity to some typical interfering gaseous species including ammonia, acetone, formaldehyde, ethanol, methanol, benzene, CO2, SO2, and CO. The remarkable improvement of the sensitive characteristics could be induced by the electronic and chemical sensitization and the synergistic effect of the AuPt bimetal. Density functional theory (DFT) is implemented to calculate the adsorption states of NO2 on the sensing materials and thus to possibly reveal the sensing mechanism. The significantly enhanced response of the SnSe2-based sensor decorated with AuPt bimetallic nanoparticles has been found to be possibly caused by the orbital hybridization of O, Au, and Pt atoms leading to the redistribution of electrons, which is beneficial for NO2 molecules to obtain more electrons from the composite material.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Yizhuo Fan,Wei Wang,Heng Guan,Caixia Liu,Xin Li,Yu Chen,Jingran Zhou,Yan Ma,Dali Liu,Shengping Ruan
Two-dimensional (2D) layered metal sulfides with abundant edge sites and weak van der Waals bonds are promising materials that absorb sensing molecules at low temperatures. The introduction of defects is an effective strategy to improve the sensing performance of two-dimensional sulfide semiconductors. In this experiment, we used a facile hydrothermal method to adjust the S content of the lattice in ZnIn2S4 microflowers(MFs). And the ZnIn 2 S 4 MFs with suitable S-vacancy content were derived from the precursor with a stoichiometric ratio (Zn/In/S) of 1:2:6. These S-defect-engineered controlled growth of ZnIn 2 S 4 MFs is composed of many nanosheets(NSs) with exposed {0001} facets grown along the c-axis direction, which has a large number of S-vacancies that can serve as active sites for sensing reactions. Thus, S-vacancy-rich ZnIn 2 S 4 MFs exhibited better sensing performance for triethylamine even at the optimum operating temperature(90 ℃), including high response(1013–100 ppm), low limit of detection(1 ppm), excellent gas selectivity, and fast response(4 s). It also shows good sensitivity to lower concentrations of triethylamine at room temperature . This work demonstrates the good effect and potential of vacancy modulation in improving the performance of two-dimensional sulfide nanomaterials for low-power sensing.
研究领域:
材料科学
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化学传感器
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 22
·20589-20600
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IF 2.22
Zhang Jianxia,Guo Huixiao,Li Shuo,Li Yu,He Yue,Li Xiaosong,Tian Chunxia,Sun Dan,Liu Li
The structure and surface properties of the sensing materials have been considered as the main factors for the fabrication of metal–oxide semiconductor gas sensors. In this paper, a one-step hydrothermal method for the preparation and control of the morphology of α-Fe 2 O 3 is reported. The results show that the amount of glycol has a great influence on the morphology of the products. With the variation in ethylene glycol concentration (from 30 to 110 ml), we can obviously see the product was assembled into three-dimensional porous α-Fe 2 O 3 micro-flower structure from two-dimensional nanochips from scanning electron microscope (SEM) pictures. When the ethylene glycol was 70 ml, the micro-flower structure was the most uniform and perfect. It additionally showed the largest specific surface area (63.69 m 2 /g) and the biggest oxygen vacancy in nitrogen adsorption–desorption and XPS analysis. Further gas sensitivity test showed that gas sensitivity was also the best. Under the low operating temperature (210 °C), the porous α-Fe 2 O 3 micro-flower (70 ml glycol) showed the highest response (49.4) to 100 ppm acetone, the sensitivity of other materials was 8.2/30 ml, 14.7/40 ml, 38.4/50 ml, 36.7/90 ml, 10.3/100 ml, 4.8/110 ml, respectively. In addition, the porous α-Fe 2 O 3 micro-flower (70 ml glycol) has excellent selectivity, short response/recovery time (1 s/31 s), low detection offline (2.2 to 0.2 ppm acetone), and good stability. The reason for the improvement of gas-sensing performance is mainly due to the change of morphology, decrease of crystallite size, the increase of oxygen vacancy, and specific surface area.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Peiman Xu,Lijun Qiu,Licheng Wei,Yiyi Liu,Dingsheng Yuan,Yi Wang,Panagiotis Tsiakaras
The efficient design of highly active, economical and stable electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte still remains a great challenge. Herein, Mn doped Ni 2 P microflowers with porous feature directly grown on Ni foam have been successfully synthesized via a facile hydrothermal method and phosphorization treatment. By detailed analyzing X-ray photoelectron spectroscopy results, it can be found that the electronic structure of Ni 2 P can be efficiently regulated by Mn doping. As expected, the Mn-doped Ni 2 P microflowers with an optimal Mn/Ni ratio of 0.053 exhibit a low overpotential of 205 mV for HER and 330 mV for OER to achieve a current density of 100 mA cm −2 in 1.0 M KOH solution. Furthermore, when this electrocatalyst is adopted as both the cathode and anode for overall water splitting, a current density of 10 mA cm -2 is achieved at a cell voltage as low as 1.58 V, accompanied with high stability.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
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2021
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IF 3.423
Chunyun Ma,Yan Zhang,Chuankai Yang,Miaorong Zhang,Jianguo Tang
Lipase was immobilized with Cu 3 (PO 4 ) 2 ⋅3H 2 O to synthesize lipase-Cu 3 (PO 4 ) 2 ⋅3H 2 O hybrid microflowers (Lip-MFs). Surfactants (Tween 80, Triton X-100 and CTAB) were added to study their effect on the morphology and activity of Lip-MFs. SEM images revealed that surfactants can increase the size of Lip-MFs and make the hierarchical structure more compact. Further, compared with other surfactants, the activity of CTAB-Lip-MFs was 1.45 times of that of free lipase, demonstrating CTAB is conducive to improve the activity of lipase.
研究领域:
生物化学
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材料科学
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产品关联
DOI
高影响因子
CARBON
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2021
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IF 9.594
Xiang Zhang,Lei Cai,Zhen Xiang,Wei Lu
At present, the development of lightweight and wideband microwave absorbing materials with stable infrared stealth property and adaptable to complex environments has become the key to multi-modal stealth technology . Herein, hollow CuS microflowers were self-assembled on biomass-derived porous carbon in situ to realize the multifunctions of microwave absorption, flame retardance and thermal stealth. The multicomponent synergistic effect combined with unique microarchitecture triggered the multiple polarization effects , multiple reflection and scattering as well as conduction loss in the PC@CuS composite. As a result, the PC 800 @CuS sample exhibited an optimal RL min of −61.5 dB and an exceptionally wide EAB of 7.8 GHz with the filling ratio of only 10%. In addition, the PC@CuS composite also exhibited superior flame-retardant properties by virtue of its distinctive porous structure . Meanwhile, the uniform distribution of CuS particles played a vital role in enhancing the overall infrared absorption efficiency, thereby obtaining stable and highly-effective infrared stealth performance comparable to commercial products. This work shed light on the development of high-efficiency MAs with multifunctions in a facile and low-cost manner.
研究领域:
材料科学
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电磁学
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热管理
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2017
·Vol. 29
·期 1
·244-250
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IF 2.019
Du Liting,Li Yu,Li Shouchun,Li Haiying,Liu Li,Cheng Yali,Duan Haojie
The hierarchical porous and nonporous SnO 2 microflowers was successfully synthesized by a simple hydrothermal method and followed by calcination procedure. The microstructure and morphology of the product were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, and scanning electron microscopy (SEM). The SEM images display that the prepared SnO 2 is a microflower composed of countless thin sheets, and each of the sheets covered in a series of porous by calcining at 500 °C. Nevertheless, there is no porous when it treated at 400 °C. The results of comparison show that the hierarchical porous SnO 2 microflowers (HPSM) sensors possess a preferable gas-sensing property. The response of HPSM sensors to 100 ppm ethanol is 205.6 at the optimum operating temperature 240 °C. Which sensitivity is almost 3.9 higher than the hierarchical nonporous SnO 2 microflowers (HNSM) (52.9). Meanwhile, the response and recovery times of HPSM (HNSM) are 3 s (3 s) and 45 s (145 s) to 100 ppm ethanol, respectively. What’s more, the minimum concentration of ethanol that we can detect is 0.1 (1.0) ppm, and the response value is 1.9 (2.0). At last, both HPSM and HNSM own a good selectivity.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
Materials Today Nano
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2022
·
IF 13.364
Z. Yan,Z. Sun,L. Zhao,H. Liu,Z. Guo,Y. Qiu,P. Wang,L. Qian
In this work, via in-situ induction of phosphorus doping, FeS 2 microflowers with sulfur vacancies were rationally designed and fabricated for lithium-ion batteries (LIBs). Phosphorus doping enlarged interlayer spacings, effectively enhanced the conductivity and facilitated the diffusion and intercalation/deintercalation of Li + . Moreover, the in-situ induced sulfur vacancies also partly rearranged electronic structures and increased more active adsorption sites for Li + . The P 1.0 -FeS 2-x electrode delivered the excellent rate performance (642.6 mAh/g at 5.0 A/g) and long-cyclic performance (544.7 mAh g -1 at 2.0 A/g after 1000 cycles). X-ray absorption fine structure spectroscopy was employed to reveal the decrease of Fe oxidation state and coordination number , confirming sulfur vacancies were in-situ induced through phosphorus doping process. Density function theory calculation declared the doping of phosphorus atoms and in-situ induced sulfur vacancies in FeS 2 could effectively adjust the charge distribution at the active sites for Li adsorption, which enhanced the conductivities and facilitated the electrochemical reaction kinetics. The anionic doping strategy may provide new ideas and routes of constructing transition metal sulfides for high-performance LIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·
IF 3.839
Jinfeng Sun,Lingzhi Guo,Miaomiao Gao,Xuan Sun,Jinyang Zhang,Longwei Liang,Yang Liu,Linrui Hou,Changzhou Yuan
Herein, we first report one-step synthesis of uniform Mo 2 C microflowers (MCMFs) from low-cost precursors via industrialized solid-state strategy. With fine optimization in precursor ratio and pyrolysis temperatures, the as-fabricated MCMFs are assembled well with interconnected single-crystalline nanosheet subunits. More encouragingly, the resultant MCMFs are further highlighted as a competitive anode with robust and long-duration lithium-storage behaviors towards high-performance Li-ion batteries
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 38
·20217-20227
·
IF 8.867
Wenbin Li,Jianfeng Huang,Liangliang Feng,Liyun Cao,Yongqiang Feng,Haijing Wang,Jiayin Li,Chunyan Yao
The meticulous design of coating structures is an efficient approach for enhancing the cycle life and rate capability of electrode materials. Herein, crystalline VOOH-coated VS2 microflowers (c-VS2@VOOH) constructed from nanosheets are successfully prepared by a facile one-step hydrothermal method. The c-VS2@VOOH composite as a sodium ion battery anode material delivers an excellent cycling stability of 330 mA h g−1 after 150 cycles at 0.2 A g−1. In particular, c-VS2@VOOH can still afford a high reversible capacity of 356 and 224 mA h g−1 even at 0.5 and 1.0 A g−1, respectively. The high capacity, good stability and enhanced rate capability are mainly attributed to the highly efficient surface sensitization and protection by crystalline VOOH, which can improve sodium ion diffusion and suppress the pulverization of VS2 nanosheets.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Jun Tang,Yali Cao,Fei Ruan,Fengfeng Li,Yangxin Jin,Minh Ngoc Ha,Xinya Han,Qingping Ke
Condensation of 2-amino-phenols with carboxylic acid derivatives has been practically used for the production of benzoxazoles, wherein the homogeneous catalytic system including strong acids and dangerous peroxides is generally employed. Herein, we report the novel approach for controlled synthesis of nitrogen-doped MnOx (denoted as N-MnO2, N-Mn5O8, and N-Mn3O4), by adjusting the heteroatom nitrogen amount, and uncover that the N-MnO2 catalyst as a sustainable and cost-effective heterogeneous catalyst exhibits high catalytic performance for condensation of 2-amino-phenols and o-phenylenediamine with alcohols into the corresponding benzoxazoles and benzimidazole, respectively. The N-MnO2 catalyst displays >99.9% yield for benzoxazole synthesis under room temperature and no decay (10 cycles), compared with the neglect activity (∼0%) for MnO2 catalysts. X-ray absorption spectroscopies and experimental studies uncovered that oxygen vacancies generated by heteroatom N doping play a key role for promoting intramolecular oxidative dehydrogenation of alcohol and 2-aminophenol derivatives to directly yield desired products. N-MnO2 catalyst rapidly oxidative dehydrogenated the reactants into corresponding benzoxazoles for 10 examples with >87.6% yields.
研究领域:
材料科学
·
催化化学
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有机合成
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）