InfoMat
·
2020
·Vol. 2
·期 3
·577-584
·
IF 0
Fengren Cao,Wei Tian,Meng Wang,Min Wang,Liang Li
Lead-free tin-based perovskites have attracted widespread research interest due to their nontoxicity and potential commercialization. However, their practical application is limited by high density of intrinsic defects and easy oxidation of Sn 2+ in ambient environment. To address these issues, we demonstrate an environment-friendly stable broadband photodetector based on CsSnI 3 perovskite with conventional SnF 2 and reducing agent ascorbic acid additive. Through optimizing the concentration of ascorbic acid, the optimal device reveals high responsivity (0.257 A W −1 ), fast response speed (0.35/1.6 ms), and excellent stability. The properties are comparable to most previously reported lead-free perovskite photodetectors. The enhanced performance is mainly due to the fact that ascorbic acid promotes the crystal growth, suppresses the formation of Sn 4+ , and makes it have good semiconductivity rather than metallicity.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Wen Zhang,Yaqin Chai,Ruo Yuan,Jing Han,Shihong Chen
This work described a two-step conjugate synthesis of a porous nanostructured materials (PTCA–Cys) composed of 3,4,9,10-perylenetetracarboxylic acid (PTCA) and l -cysteine (Cys) and then the sensor prepared by the deposited gold nanocrystals (DpAu) immobilized in this nanostructure film was developed. The interesting PTCA–Cys layer not only could provide SH-functionalized interface but also easily forms a stable thin film on the electrode surface with the porous nanostructure , thus, it is very beneficial to electrode modification. Furthermore, with the DpAu film onto PTCA–Cys modified electrode , the proposed sensors exhibited the excellent catalytic activity and the high selectivity toward the oxidation of AA , DA and UA . Moreover, scanning electron microscopy, cyclic voltammetry and different pulse voltammetry were employed to characterize the sensors. Under the optimal conditions, the linear response range for simultaneous detection of AA, DA, and UA were 20–700 μM, 2–402 μM and 0.4–252.4 μM, respectively, and the detection limits were 6.40 μM, 0.67 μM and 0.12 μM (S/N = 3). More importance, the proposed method offers promise for simple, rapid and cost-effective analysis of small biomolecules .
研究领域:
生物传感器
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY
·
2023
·Vol. 28
·期 4
·379-391
·
IF 3
Chen Chan,Tang Weikang,Chen Qinfei,Han Mengqi,Shang Qi,Liu Wenbin
Hydroxytyrosol, one of the most powerful natural antioxidants, exhibits certificated benefits for human health. In this study, a biomimetic approach to synthesize hydroxytyrosol from the hydroxylation of tyrosol was established. EDTA-Fe 2+ coordination complex served as an active center to simulate tyrosine hydroxylase. H 2 O 2 and ascorbic acid were used as oxygen donor and hydrogen donor, respectively. Hydroxy radical and singlet oxygen contributed to active species. The biomimetic system displayed analogous component, structure, and activity with TyrH. Hydroxytyrosol titer of 21.59 mM, and productivity of 9985.92 mg·L −1 ·h −1 was achieved with 100 mM tyrosol as substrate. The proposed approach provided efficient and convenient route to quickly produce high amount of hydroxytyrosol. Graphical abstract
研究领域:
生物化学
·
合成生物学
·
抗氧化研究
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 33
·期 2
·025501
·
IF 3.874
Ruyan Xie,Nannan Zhang,Yaoyao Qu,Mingyu Tang,Fang Zhang,Fang Chai,Zhongmin Su
Herein, we have reported a facile one-pot strategy to synthesize fluorescent Cu nanclusters (Cu NCs) by using ʟ-histidine as stabilizer, and ascorbic acid as reducing agent. Cu NCs are stable, water-dispersible, and emit bright cyan emission with a quantum yield 26.08%. The Cu NCs can be employed as colorimetric and fluorimetric dual-mode detector, exhibiting excellent selectivity and sensitivity for detecting 2,4-dinitrophenol (DNP) specifically. Notably, Cu NCs were a sensitive sensor, which had speciality to detect DNP in range of linearity from 0.01 to 0.15 mM with a discernable limit as low as 3.96 μM. The mechanism of efficiently selective detection of DNP by Cu NCs was analyzed by UV absorption, fluorescence decay spectrum, and the performance of 'turn off' towards DNP was determined as the inner filter effect and static quenching effect. Further, the environmental tolerance of the Cu NCs probe was estimated by using the different natural water samples, demonstrating its great promise in the field of DNP monitoring and water sample analysis.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 5
·589-595
·
IF 3.719
Tian Li,Zhang Boxun,Sun Ding,Chen Ruizhan,Wang Binbin,Li Tianjiao
We have fabricated, in a single step, carbon ceramic electrodes modified with a poly(acridine orange) film containing reduced graphene oxide. They display electrocatalytic activity to ascorbic acid (AA) and uric acid (UA) at pH 4.5. The anodic peak potentials of AA and UA are separated by 276 mV so that they can be well resolved in cyclic voltammetry. UA and AA were simultaneously determined in a mixture at working potentials of 170 and 400 mV, respectively. Under optimized conditions, the calibration curves for AA and UA cover the 0.8–5,000 μM and 0.6–900 μM concentration range, respectively, while detection limits are 0.3 μM and 0.2 μM. The electrode was applied to determine AA and UA in urine samples.
DPV curves of RGO–PAO/CCE in the phosphate buffer solution (pH 4.5) containing 5.0 × 10 −5 mol L −1 AA with different concentration of UA (a → f: 0, 1, 3, 5, 7, 9 × 10 −6 mol L −1 )
研究领域:
分析化学
·
电化学
·
生物传感器
·
临床检验诊断学
·
纳米材料
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2015
·Vol. 58
·期 5
·881-888
·
IF 1.192
Yang AiLing,Li ShunPin,Wang YuJin,Wang LeLe,Bao XiChang,Yang RenQiang
Ag@Cu 2 O core-shell metal-semiconductor nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Ag@Cu 2 O core-shell NPs were easily converted to Ag@Cu bimetallic core-shell NPs with the help of surfactant PVP and excessive reducer ascorbic acid in air at room temperature, which is a unique phenomenon. Varying volumes of Ag colloidal solutions were added into the reaction mixtures containing fixed initial concentrations of Cu 2+ and PVP, Ag@Cu 2 O and Ag@Cu core-shell NPs with fixed core size but varying outer shell thicknesses could be obtained. The composites, structures, morphologies and extinction properties of Ag@Cu 2 O and Ag@Cu core-shell NPs were systematically characterized by XRD, TEM and extinction spectra. Both of these NPs show wide tunable optical properties. The extinction peaks could be shifted from 421 nm to 700 nm. FTIR results reveal that Cu + ions on the surface of Cu 2 O nanocrystalline coordinate with N and O atoms in PVP and further are reduced to metallic Cu by excessive ascorbic acid and then form a nucleation site on the surface of Cu 2 O nanocrystalline. PVP binds onto a different site to proceed with the reduction until all the Cu sources in Cu 2 O NPs are completely assumed. And the shell of Cu 2 O is converted to Cu shell. The synthesis approach in this paper is simple and also a promising reference for synthesizing other core-shell NPs. Ag@Cu 2 O NPs can be easily converted to Ag@Cu NPs in air at room temperature, which is promising to be used in electronic devices.
研究领域:
纳米材料化学
·
无机功能材料
·
胶体与界面化学
·
光谱学
·
半导体物理
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Hao Lin Zou,Bang Lin Li,Hong Qun Luo,Nian Bing Li
Graphene oxide (GO) has been demonstrated to be functionalized by hemin without any other reducing agents and the hemin functionalized graphene oxide (H-GO) hybrid nanomaterial was obtained under the condition of sonication, which could be ascribed to the π–π stacking and cation-π interactions between GO and hemin molecules. H-GO composite, characterized by scanning electron microscopy and UV–vis absorption spectroscopy, was used for preparation of the modified electrode considering its great electrocatalytic activity, large surface area, and abundant active sites. Due to the unique structure and excellent properties, H-GO modified glassy carbon electrode (GCE) showed high electrocatalytic activities for the oxidation of ascorbic acid, dopamine, and uric acid, achieving the simultaneous determination for those three different kinds of biomolecules with detection limits of 0.3, 0.17, and 0.17 μmol L −1 ( S / N = 3), respectively. In addition, the proposed biosensor exhibited high selectivity and good stability, which could be applied for the electrochemical determination in practical samples with satisfying results.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Mengxiao Zhong,Maoqiang Chi,Yun Zhu,Ce Wang,Xiaofeng Lu
Controllable fabrication of novel and uniform noble metal nanoparticles on a specific support with a superior catalytic or electrocatalytic performance is of significantly importance for practical applications. In this report, we demonstrated an effective way to fabricate uniform thin-walled Pd/polypyrrole (PPy) hollow nanotubes . The prepared Pd/PPy hybrid nanotubes exhibited an excellent peroxidase-like activity to oxidize a typical peroxidase substrate such as 3,3′,5,5′-tetramethylbenzidine in comparison with traditional Pd/C and Pd black catalysts. The outstanding catalytic activity of the Pd/PPy hybrid nanotubes for peroxidase mimicking could be resulting from their unique hollow characteristic and an interfacial effect between PPy and Pd components. Based on the favorable catalytic property of the Pd/PPy hybrid nanotubes, a convenient and rapid colorimetric way to sensitively determine ascorbic acid has been presented. The detection limit was around 0.062 μM and an excellent selectivity was also achieved. The developed detection system in this study could be extended to the fields of bioscience and biotechnology with promising prospects.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 7
·期 6
·5172-5184
·
IF 1.5
Xu Zhu,Qin Liu,Xiaohua Zhu,Chunlan Li,Maotian Xu,Yong Liang
A new approach to synthesize graphene was applied by reduction of graphene oxide using ascorbic acid. Chitosan/graphene modified electrode could be employed for simultaneous determination of dopamine and ascorbic acid. The modified electrode showed excellent electrocatalytic activity towards the oxidation of DA and AA. The calibration curves for DA and AA were obtained in the range of 0.3-1067.5μM and 0.6-1378.1μM, respectively. Detection limits were 0.1μM and 0.01μM for DA and AA, respectively. The present method was applied to the determination of AA and DA in human serum samples and the results were quite promising.
研究领域:
分析化学
·
电化学
·
生物传感器
·
纳米材料
·
临床检验
·
神经化学
·
药物分析
✓ 已验证
DOI
高影响因子
NANO
·
2017
·
IF 1.025
Yanju Wu,Huijun Song,Kui Lu,Yong Ye,Mingxiu Lv,Yufen Zhao
The electrodeposition of reduced graphene oxide (rGO) film with preferred vertical orientation was fabricated on a glassy carbon electrode by using pulse potential method in a graphene oxide solution. The rGO film was applied in developing a high-sensitive electrochemical sensor for detection of levodopa (L-dopa). The new electrochemical sensor displayed a significant response to L-dopa because of its excellent electric conductivity and large specific surface area. Moreover, the determination of L-dopa on this modified electrode was not interfered by the coexistence of ascorbic acid (AA) and uric acid (UA). Under the selective conditions, the modified electrode showed a linear voltammetric response to L-dopa within a certain concentration ranging from 5 . 0 × 1 0 − 7 − 1 . 5 × 1 0 − 4 mol L − 1 , with the detection limit of 1 . 0 × 1 0 − 7 mol L − 1 . Besides, the modified electrode also exhibited an excellent selectivity, stability, reproducibility and repeatability.
研究领域:
分析化学
·
电化学
·
生物传感器
·
药物分析
·
纳米材料
·
神经药理学
·
转化医学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Hongjun Chen,Wang Li,Peng Zhao,Zhou Nie,Shouzhuo Yao
Herein, a CdTe/CdS QDs (with a CdTe core and a CdS shell) amplified electrogenerated chemiluminescence (ECL) of nitrogen functional graphene quantum dots (NGQDs) platform is reported. The utilization of CdTe/CdS QDs could facilitate the production of NGQDs radical, and then, a high yield of NGQDs* was formed due to the interaction of NGQDs radical with O 2 − , leading to an ∼21-fold ECL enhancement. This ECL enhancing system does not require the addition of coreactant and modification of electrode which is carried out in homogeneous solution. Benefiting from the remarkable ECL enhancement effect, a feasible and sensitive ECL sensor was constructed for ascorbic acid (AA) quantification. The proposed method features a detection limit of 70 nM with a linear calibration range from 100 nM to 100 μM, and exhibits good stability, practicability, and acceptable fabrication reproducibility, showing promising application in real-sample.
研究领域:
生物传感
·
电化学发光
·
纳米材料
·
食品分析
·
量子点技术
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Xiaofang Liu,Ling Zhang,Shaping Wei,Shihong Chen,Xin Ou,Qiyi Lu
In the present work, a novel strategy based on overoxidized polyimidazole (PImox) and graphene oxide (GO) copolymer modified electrode was proposed for the simultaneous determination of ascorbic acid (AA), dopamine (DA), uric acid (UA), guanine (G) and adenine (A). The copolymer was characterized by the scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). Due to the synergistic effects between PImox and GO, the proposed electrode exhibited excellent electrochemical catalytic activities and high selectivity and sensitivity toward the oxidation of AA, DA, UA, G and A. The peak separations between AA and DA, AA and UA, UA and G, and G and A were 140 mV, 200 mV, 380 mV and 300 mV, respectively. The linear response ranges for AA, DA, UA, G and A were 75–2275 μM, 12–278 μM, 3.6–249.6 μM, 3.3–103.3 μM and 9.6–215 μM, respectively, and corresponding detection limits were 18 μM, 0.63 μM, 0.59 μM, 0.48 μM and 1.28 μM.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）