Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5006-5015
·
IF 6.569
Ruozhen Wu,Juanyuan Hao,Tingting Wang,Shengliang Zheng,You Wang
The two-dimensional layered metal dichalcogenides (LMDs) SnS2 is an interesting candidate for high-performance NO2 gas sensors. However, most SnS2-based NO2 sensors are usually inert for detecting ppb-level NO2 at room temperature (RT) because of the intrinsic features of a large bandgap, poor conductivity, and lack of active sites. Herein, we successfully endowed SnS2 with ppb-level NO2 detection at RT by using a carbon (C)-doping strategy. Compared to the pristine SnS2 showing a negligible response toward NO2 at RT, the C-doped SnS2 exhibited an excellent response (481.3% for 1 ppm and 146.5% for 100 ppb) with full recovery. The sensitivity toward ppb-level NO2 was as high as 1200% ppm−1. Moreover, the experimental and theoretical limit of detection (LOD) were down to 10 ppb and 0.3 ppb, respectively. Such impressive gas-sensing performance of C-doped SnS2 at RT was due to the doping-mediated synergistic effect of energy-band modification and the presence of an S vacancy. The results provide a real solution for developing high-performance LMDs-based gas sensors.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2016
·Vol. 141
·期 7
·2303-2307
·
IF 4.033
Lina Yao,Fei Yan,Bin Su
Halonitrobenzenes (HNBs) are a class of molecules that are highly toxic to human health and the ecological environment. Thus, effective and efficient approaches capable of monitoring and detecting HNBs are greatly desired. We report herein a simple and sensitive method for the detection of HNBs. The detection was based on the indium tin oxide (ITO) electrodes modified with a binary assembly of highly ordered surfactant micelles (OSMs) and silica mesochannels (SMs). The SMs have a diameter of 2–3 nm and a vertical orientation, which provide a hard support to stabilize soft OSMs. Moreover, each OSM consists of a hydrophobic core due to the organized assembly of surfactant hydrocarbon chains, which can selectively extract and concentrate lipophilic HNBs from aqueous media, allow their transport to the underlying ITO electrode surface and therein their detection by voltammetry. As a proof-of-concept experiment, 1-chloro-3-nitrobenzene, 1-chloro-4-nitrobenzene, 1-bromo-4-nitrobenzene and 2,4-dinitrobromobenzene were analyzed in aqueous solutions. A simple and fast detection was achieved in all cases, with a wide linear dynamic range, a high sensitivity and a low limit of detection at the ppb level. Apart from the extraction ability, the OSMs also prohibited the access of and surface contamination by unwanted substances, showing excellent anti-fouling and anti-interference power. Indeed, as we demonstrated, the sensor could be employed for direct electrochemical detection of HNBs in complex samples, such as lake water and soil dispersion, without any pre-treatment, indicating its potential usefulness in practical analysis.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Jie Wan,Chengao Liu,Xiaoxia Wang,Huajing Wang,Lu Tang,Zhenming Du,Wulin Song,Dawen Zeng
Safety problem caused by the leakage of electrolyte in lithium-ion batteries (LIB) have become a critical hot issue. However, since the main components of LIB electrolyte, such as dimethyl carbonate (DMC), are volatile or redox, trace electrolyte leakage is difficult to detect. Therefore, in order to realize early detection of electrolyte leakage and real-time monitoring of LIB health, here we report a success of DMC gas detection by MOS sensor based on Co/Pd-doped SnO 2 nanomaterial for LIB health monitoring. In detail, the sensor showed high response to DMC when compared to interfering gases. Especially, the sensor could detect DMC down to the ppb level (the response value of the 500 ppb DMC is about 1.6). The response and recovery time for 1 ppm DMC were about 66 s and 240 s, respectively. The response of the sensor was obvious even when the leakage levels were as low as only 0.1 μL electrolyte. Furthermore, in the simulated electrolyte leakage via LIB penetration experiment, the sensor successfully exhibited an instant response, which proved that this work effectively provides a new approach for LIB real-time health and safety monitoring.
研究领域:
材料科学
·
传感器技术
·
电池安全
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 17
·9149-9161
·
IF 3.917
Zhu Hongxiang,Guo Wei,Wang Jian,He Hui,Hou Xudong,Zhou Shile,Wang Shuangfei
Abstract A novel biomass pulp fibre (PF)-based colorimetric sensor was prepared by grafting l -lysine ( l -lys) onto the surface of PFs via a Schiff base reaction. The grafted l -lys contained two specific synergistic recognition groups (–COOH and –NH 2 ), which only recognize Ag + . The as-prepared sensor (DAPF- l -lys) showed excellent selective recognition of Ag + and an obvious visual colour change from light-yellow to brown in aqueous solutions containing other ions (Cu 2+ , Pb 2+ , Mn 2+ , Mg 2+ , Cd 2+ , Ca 2+ , H 2 O, Al 3+ , Hg 2+ , Cr 6+ , K + , Na + and Zn 2+ ). The visual limit of detection for Ag + was 10 –7 mol/L. Furthermore, DAPF- l -lys responded to Ag + within 30 s based on the dynamic conditions of the detection method. The biomass PF matrix possessed the excellent properties, including a large external surface area, a short transit distance and good flexibility. When specific synergistic recognition groups were grafted onto the PF of the prepared PF-based colorimetric sensor, Ag + could be rapidly absorbed and enriched on the surface of DAPF- l -lys through only bi-dentate ligand chelation between Ag + and the synergistic recognition groups (–COOH and –NH 2 ) of DAPF- l -lys. Thus, the DAPF- l -lys colorimetric sensor exhibited promising prospects for on-site identification of Ag + (the level of ppb ) due to its high selectivity and sensitivity. Graphic abstract
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Materials Science
·
2022
·Vol. 16
·期 4
·1-9
·
IF 2.612
Zhu Chaoqi,Li Xiang,Wang Xiaoxia,Su Huiyu,Ma Chaofan,Guo Xiang,Xie Changsheng,Zeng Dawen
Efficient chemical warfare agents (CWAs) detection is required to protect people from the CWAs in war and terrorism. In this work, a Pd-doped SnO 2 nanoparticles-based gas sensor was developed to detect a nerve agent simulant named methyl salicylate. The sensing measurements of methyl salicylate under different Pd doping amounts found that the 0.5 at.% Pd-doped SnO 2 exhibited a significant improvement in the detection of methyl salicylate at the ppb (1 ppb = 10 −9 ) level, and the response value to 160 ppb methyl salicylate is 0.72 at 250 °C. Compared with the pure SnO 2 , the response value is increased by 4.5 times, which could be attributed to the influence of the noble metal Pd on the oxygen state and its catalytic effect. In addition, the 0.5 at.% Pd-doped SnO 2 sensor still has an obvious response to 16 ppb methyl salicylate with a response value of 0.13, indicating the lower detection limit of the sensor.
研究领域:
材料科学
·
化学传感器
·
纳米技术
·
环境监测
✓ 已验证
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 17
·3591
·
IF 4.967
Xianyang Li,Yuhui Feng,Tao Yi,Yan Piao,Dong Hyuk Park,Longzhen Cui,Chunzhi Cui
The significance of DNA is no longer limited to its role as a biological information carrier; as a natural polymer, it also become in the field of materials. Single-stranded DNA (ssDNA) molecules with specific sequences can form a G-quadruplex or hairpin-shaped conformation with specific heavy metal ions through coordination bonds. In this study, ssDNA molecules of the four sequences were prepared into hybrid assemblies with one of the famous display materials, the tris-(8-hydroxyquinoline)aluminum (Alq3) semiconductor. Based on these hybrid assemblies, heavy metal ions, namely Pb2+, Hg2+, Cd2+and As3+, were detected individually at the ppb level. Apart from this, in practical application, many samples containing heavy metal ions are digested with acid. By introducing MES buffer solution, the influence of acidity on the fluorescent signal of Alq3was excluded. This strategy showed promising results in the practical application of detecting heavy metal ions in shrub branches and leaves.Keywords:DNA;heavy metal ions;tris-(8-hydroxyquinoline)aluminum
研究领域:
材料科学
·
分析化学
·
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Rui Jin,Deshuai Kong,Xu Yan,Xu Zhao,Hongxia Li,Fangmeng Liu,Peng Sun,Yuehe Lin,Geyu Lu
Precise on-site profiling of organophosphate pesticides (OPs) is of significant importance for monitoring pollution and estimating poisoning. Herein, we designed a simple and convenient portable kit based on Ag+-responsive hydrogels for accurate detection of OPs. The newly developed hydrogels employed o-phenylenediamine (OPD) and silicon quantum dots (SiQDs) as indicator, which possessed ratiometric response. In this sensor, OPs as inhibitor of acetylcholinesterase prevented the generation of thiocholine, which blocked the formation of metal–polymer with Ag+, further triggered the oxidation of OPD to yield yellow 2,3-diaminophenazine (DAP) with fluorescence emission at 557 nm. The fluorescence intensity of SiQDs (444 nm) was quenched by DAP through inner filter effect (IFE) process, emerging a typical ratiometric response. Interestingly, the ratiometric signal of kit, which was recorded by smartphone’s camera, can be transduced by ImageJ software into the hue parameter that was linearly proportional to the concentration of OPs. The simplicity of portable kit combined with smartphone operation, which possessed high sensitivity (detection limit <10 ng mL–1) and rapid sample-to-answer detection time (45 min) in agricultural sample, indicating that the methodology offered a new sight for portable monitoring of food safety and human health.
研究领域:
分析化学
·
环境科学
·
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）