Sensors & Diagnostics
·
2023
·
IF 0
Zeyi Wang,Yuping Li,Jian Zhang,Xiao Huang
As a piezoelectric ceramic material, SeZnO3 has received increasing attention for pressure sensing. However, the poor conductivity and low dielectric constant of bare SeZnO3 severely limit its wide applications. Herein, to improve the pressure sensing properties of SeZnO3, SeZnO3 nanosheets composited with Ag nanoplates were synthesized via a dissolution coprecipitation method, which exhibited a higher sensitivity (54.8 kPa−1) to external pressure with an excellent repeatability than that of bare SeZnO3 nanosheets (12.3 kPa−1). The enhanced pressure sensing properties of Ag/SeZnO3 nanocomposites could be attributed to an increased dielectric constant and an enhanced charge output. Moreover, the nanocomposite-based pressure sensors showed an accelerated response/recovery rate (0.7 s/2.7 s) because of the effective charge transfer between SnZnO3 and Ag, which was confirmed by XPS results. This Ag/SeZnO3 composite nanosheet-based pressure sensor demonstrates a potential for practical monitoring of human movement.
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DOI
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Li Wang,Xingwei Li,Gengchao Wang
An electrochemical stable conductive network is built to improve the pseudocapacitance of polyaniline . As a proof-of-concept demonstration, p olyaniline/ITO composite is synthesized by in-situ oxidation polymerization of aniline in the dispersed system of ITO nanoparticles . The electrical conductivity of the optimal polyaniline/ ITO composite is 14.42 S cm −1 , while that of contrast polyaniline is 1.88 S cm −1 . P olyaniline/ ITO coated on the oxidized carbon cloth (polyaniline/ITO@oxidized carbon cloth) displays a specific capacitance of 1505.7 mF cm −2 at a current density of 0.5 mA cm −2 , and the capacitance retention reaches 75% with a growth of the current density from 0.5 to 5 mA cm −2 , while those of polyaniline@oxidized carbon cloth are 847.9 mF cm −2 and 68.3% . It is noteworthy that the capacitance retention of polyaniline/ITO@oxidized carbon cloth symmetrical capacitor is high up to 90.1% after 2000 cycles at a current density of 1 mA cm −2 . Moreover, a high energy density of 31.18 μWh cm −2 is also attained at a power density of 0.35 mW cm −2 .
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高影响因子
iScience
·
2022
·
IF 6.107
Yuan-Jun Tong,Lu-Dan Yu,Yanjun Huang,Yutong Li,Nan Li,Qi Fu,Yu-Xin Ye,Fang Zhu,Janusz Pawliszyn,Jianqiao Xu,Gangfeng Ouyang
Carbon quantum dots (CQDs) are highly promising to be applied in light-emitting, chemosensing, and other cutting-edge domains. Herein, we successfully fabricate high-quality full-color CQDs under unprecedentedly low temperature and pressure (85°C, 1.88 bar). Stable and narrow fluorescent emissions ranging from blue to green and red light were realized by simple amine engineering, which were further mixed into white-light CQDs with the absolute photoluminescent quantum yield reaching 19.2%. The average mass yield of the CQDs reached 69.0%. The optical performances demonstrated that the CQDs possessed uniform luminescent centers and dominant radiative decay channels. Component analysis further suggested that dehydrated condensation between carboxyl and amine groups directed the growth of the CQDs. By utilizing the CQDs, full-color light-emitting diodes and logic gate sensors were developed. This study paves an important step for promoting the application of CQDs by providing an energy-efficient, safe, and productive synthetic strategy.
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高影响因子
FOOD CHEMISTRY
·
2016
·
IF 4.052
Jinhu Tian,Shiguo Chen,Chunhua Wu,Jingqiu Chen,Xinyi Du,Jianchu Chen,Donghong Liu,Xingqian Ye
The effects of preparation method (boiled, cooled, and reheated) on the structural characteristics and in vitro digestibility of potato were investigated. The highest equilibrium starch hydrolysis was obtained after boiling (82.21%), followed by reheating (66.98%) and cooling (54.31%). The potato after cooling treatment exhibited a narrower melting temperature range and a higher melting enthalpy compared with the potatoes after boiling and the microwave reheating. X-ray diffraction patterns revealed that the relative crystallinity of the cooled potato was higher than those of the reheated and boiled potatoes, consistent with the results in melting enthalpy. Moreover, compared with the boiled potato, a large number of wrinkles were observed on the surface of the cooled potato, whereas after microwave reheating, larger clearances of starch granule regions were found. This study demonstrated that cooling and microwave reheating significantly affected the potato’s microstructure and digestibility and were suggested as alternative choices to prepare potato dishes.
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高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2023
·
IF 10.9
Ye Wang,Ruixiang Ge,Xiang Liu,Jing Li,Haohong Duan
Nucleophile oxidation reaction (NOR) is emerging as a significant approach for the sustainable production of value-added chemicals. Among the various types, electrocatalytic glycerol oxidation reaction (GOR) stands out as a crucial method for producing C 1 to C 3 chemicals including formic acid (FA). Nonnoble-metal-based (oxy)hydroxides have found extensive use in GOR, yet achieving industrially-demanded current densities (> 300 mA·cm −2 ) at moderate potentials remains a challenge. It is well documented that GOR catalyzed by (oxy)hydroxides follows an indirect oxidation mechanism. Specifically, the nucleophile, glycerol, undergoes oxidation by the electrogenerated oxyhydroxides with electrophilic adsorption oxygen. Therefore, comprehending the evolution of the electrocatalyst in GOR is critically important. In this paper, we have developed molybdenum-doped nickel oxyhydroxides (Mo-NiOOH) through cyclic voltammetry (CV) activation of nickel molybdate (NiMoO 4 ). We demonstrated that Mo species leach from NiMoO 4 , and the resulting Mo-NiOOH retains the nanosheet array morphology of NiMoO 4 . We subjected the freshly prepared Mo-NiOOH to systematic characterizations employing techniques such as scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) mapping, Raman spectroscopy, inductively coupled plasma-mass spectrometry (ICP-MS), and X-ray photoelectron spectroscopy (XPS). The above structural characterizations confirm that Mo-NiOOH inherits the nanosheet array morphology of the NiMoO 4 precursor with reduced Mo content, thereby indicating the phase reconstruction from oxides to oxyhydroxides post CV activation. Furthermore, the Ni 3+ /Ni 2+ ratio in Mo-NiOOH surpasses that in NiOOH derived from CV activation of Ni(OH) 2 . Mo-NiOOH exhibits elevated electrochemically active surface areas (ECSAs) and a higher Ni 3+ /Ni 2+ ratio compared to NiOOH obtained through CV activation of Ni(OH) 2 , facilitating the Mo-NiOOH exhibits higher ratio of Ni 3+ /Ni 2+ , higher electrochemically active surface areas (ECSAs) than NiOOH, and facilitated oxidation of Ni 2+ to Ni 3+ . Consequently, Mo-NiOOH requires a lower applied potential than NiOOH (1.51 V versus 1.84 V vs . reversible hydrogen electrode (RHE)) to achieve a high current density (400 mA·cm −2 ). Additionally, Mo-NiOOH demonstrates higher Faradaic efficiency towards formate (FE formate ) in contrast to NiOOH (84.7% versus 59.6%), indicating enhanced carbon-carbon (C—C) bond cleavage due to Mo doping. Multi-potential step (STEP) experiments indicate that GOR catalyzed by NiOOH and Mo-NiOOH follows a similar indirect oxidation mechanism mediated by oxyhydroxides. Operando electrochemical impedance spectroscopy (EIS) and in situ Raman spectroscopy confirmed that Mo doping in NiOOH accelerates GOR kinetics and the oxidation of Ni 2+ to Ni 3+ , contributing to the higher activity and formate selectivity of Mo-NiOOH than NiOOH. The strategy of surface modulation of oxyhydroxides through leaching of soluble anions offers guidelines for the rational design of high-performance NOR electrocatalysts. Download: Download high-res image (72KB) Download: Download full-size image
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高影响因子
JOURNAL OF CULTURAL HERITAGE
·
2024
·
IF 3.5
Jose A. Madrid García,Effat Yahaghi,Amir Movafeghi,Mahdi Mirzapour
Preserving soft plastic or elastomeric material toys in museums and detecting their defects have become increasingly important. Accurate information regarding cracks and fissures in these toys is essential for preservation and restoration processes. Visual inspection is typically the first step in identifying damage, and various tests such as FTIR and NIR are commonly used to assess the condition of toys with a soft or flexible texture. However, these methods do not provide the location and size of the defects. Radiographic Testing (RT) is a valuable non-destructive method that can reveal the size and location of defects and fissures in toys crafted from an elastomeric material for conservation planning. However, X-ray radiographs often appear foggy due to the low atomic number of elastomeric material and the thinness of these toys. To address this issue, a cartoon texture image processing method based on a Gaussian filter was applied to digital radiographs to enhance the imaging contrast of the original radiographs. The results demonstrate that this method effectively identifies toys' defects, fissures, and internal structures. The contrast in the reconstructed image increased threefold compared to the original radiographs, according to the line profile method in the Duplex Image Quality Indicator (DIQI) region. Additionally, the size of cracks can be estimated by comparing them with the intervals of lines in the DIQI.
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高影响因子
ELECTROANALYSIS
·
2016
·Vol. 28
·期 9
·2070-2074
·
IF 2.471
Lili Bie,Xue Luo,Luqi Kang,Daiping He,Ping Jiang
Commercially available copper foam (CF) was used as a 3D porous electrochemical sensing platform for nonenzymatic glucose detection. CF shows high electrocatalytic activity towards glucose oxidation and can be used directly for glucose electrochemical sensing without any pretreatment. The sensor exhibits high performance towards glucose in 0.1 M NaOH solution with the linear range from 1 μM to 0.5 mM, the sensitivity of 5.85 mA mM −1 cm −2 and the detection limit of 0.5 μM (S/N=3) simultaneously. Furthermore, the sensor shows a high selectivity for glucose against the common interferences and good reliability for glucose detection in human serum samples.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 13
·H1087
·
IF 3.014
Yongzhen Shen,Xiaohui Ren,Xiang Qi,Jie Zhou,Zongyu Huang,Jianxin Zhong
The exploration of high efficient eletrocatalysts for hydrogen evolution reaction (HER) is a challenge as well as an opportunity for future applications in renewable sustainable energy. In this paper, a two-dimensional laminate MoS2/TiO2 heterostructure, in which the MoS2 nanosheet is loaded with TiO2 nanoparticles, have been synthesized via a facile hydrothermal process. The as-prepared MoS2/TiO2 electrode demonstrates improved electrocatalytic performance compared to bare MoS2 or TiO2 electrodes. Subsequently, a series of characterization techniques including X-ray diffraction and Raman spectroscopy are carried out to confirm crystallization of MoS2/TiO2 hybridization. Additional morphological and microstructural tests verify a distinct MoS2 framework, indicating a relative stability of MoS2 nanosheet platform. Electrochemical measurements reveal the overpotential and Tafel slope of as-prepared MoS2/TiO2 electrode are −185 mV and 46 mV/dec, which are very close to that of Pt electrode. The HER improvement is proposed to be attributed to the increase conductivity which derives from the reactive MoS2 layer structure, as well as the synergic effect of MoS2/TiO2 heterostructure. We hope this work could provide a novel prototype for the efficient hybrid HER catalysts.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 6
·D289
·
IF 2.588
X. G. Zheng,Y.-N. Shi,K. Lu
To minimize pores or voids that left after electro-healing by plain solution without additives, controllable electro-healing was investigated in pure Ni plates with a through-thickness crack in a Watts bath by adding polyethyleneimine (PEI) and saccharin. Controllable electro-healing means that the growth velocity of healing crystals from crack tips is much faster than that from sidewalls of the crack, which reduces the number of pores owing to depletion of healing solution. Rotating disk electrode (RDE) was introduced to evaluate the electrochemical behavior in crack tips and crack center. Voltammograms and galvanostatic measurements indicated that PEI exhibits a convection-dependent inhibition effect on Ni deposition. The addition of saccharin will much enhance the inhibition behavior of PEI, controllable electro-healing was achieved with the presence of both PEI and saccharin.
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高影响因子
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2021
·Vol. 36
·期 12
·125022
·
IF 2.352
Yuchang Liu,Hongjie Liu,Anjie Hu,Yingmei Wei,Wenchao Ou,Xianwang Deng,Shaopeng Wang,Kefu Yu
The quest to develop inexpensive chemical sensing materials that are energy-efficient, portable, and with efficient performance lies at the center of next-generation sensor development. Owing to their low cost, easy preparation, high response, and smooth integration with electronic circuits, metal oxide semiconductors have received particular attention. Yet, metal oxide semiconductor based sensors often suffer from high power consumption due to their high operating temperature, which hinders them from practical applications. To solve this problem, herein, we proposed ultrathin sub-4 nm SnO2 films synthesized by a facile tunable hydrothermal method. Benefiting immensely from its two-dimensional anisotropic nature, the proposed SnO2 ultra-thin film exhibits a large specific area of 94.41 m2 g−1 and possesses surface oxygen vacancies. The obtained sample was practically applied as a gas sensor; the results indicate that the ultra-thin SnO2 film based sensor exhibits the highest sensitivity to triethylamine (19.2 at 100 ppm), outstanding repeatability, and excellent sensing selectivity at a low working temperature of 150 °C.
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高影响因子
Systems Microbiology and Biomanufacturing
·
2023
·
IF 0
Sun Tingting,Liu Di,Zhang Linmeng,Fan Taiping,Cai Yujie
(2R,3R)-BDO is an important bio-based four-carbon platform compound and widely used in chemical, food, pharmaceutical, fuel and aerospace fields . Serratia marcescens has been shown to be an effective strain for producing BDO. However, there have been few reports on the metabolic engineering of this strain to efficiently produce (2R,3R)-BDO using xylose. In this study, the endogenous strong promoter was screened and modified, and combined with the screened RBS. (2R,3R)-BDO was successfully produced by combining the selected promoters and RBS with the overexpressed key enzymes (ALS, ALSD, BDH, GLF) of (2R,3R)-BDO production. The optimum fermentation temperature and pH were 37 ℃ and 6.0, respectively, and the optimized yield reached 6.0 g/L. After batch fermentation, the (2R,3R)-BDO yield reached 36.6 g/L. This provided a good idea for efficient production of (2R,3R)-BDO from xylose.
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Nanomanufacturing and Metrology
·
2023
·Vol. 6
·期 1
·1-10
·
IF 0
Chen Zanyu,Hu Jiugang,Ding Kuixing,Tan Jun,Hou Hongshuai,Ji Xiaobo
Titanium oxides have been considered promising anode materials for lithium-ion batteries (LIBs). However, the poor conductivity and low specific capacity of bulk titanium oxides limit their application. In this study, a carbon dot-modified TiO 2 @SiO 2 aerogel was successfully fabricated through a facile ambient pressure drying strategy and used as an anode material of LIBs. Benefiting from the crosslinking of carbon dots and the surface modification of SiO 2 , the as-prepared hierarchical aerogel exhibited a high initial discharge capacity of 974 mAh g −1 and maintained a capacity of 299 mAh g −1 after 100 cycles at 0.1 A g −1 . It also retained a discharge capacity of 111 mAh g −1 with a CE of 99.9% at 3 A g −1 . The carbon dot-modified cross-linking skeleton contributes to the structural integrity of the TiO 2 @SiO 2 aerogel during repeated insertion/extraction of lithium ions, guaranteeing outstanding cycling and high-rate performance. This ambient pressure drying strategy provides a facile and feasible way to produce high-performance aerogel anode materials for lithium-ion storage.
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DOI
危险品化学品经营许可证（带存储）