scholarly journals Highly Sensitive Gas Sensing Material for Environmentally Toxic Gases Based on Janus NbSeTe Monolayer

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2554
Author(s):  
Deobrat Singh ◽  
Rajeev Ahuja
Keyword(s):  
Charge Transfer ◽  
Transport Properties ◽  
High Performance ◽  
Gas Sensing ◽  
Visible Region ◽  
High Sensitivity ◽  
Binding Strength ◽  
Toxic Gases ◽  
Gas Molecules ◽  
So2 Gas

Recently, a new family of the Janus NbSeTe monolayer has exciting development prospects for two-dimensional (2D) asymmetric layered materials that demonstrate outstanding properties for high-performance nanoelectronics and optoelectronics applications. Motivated by the fascinating properties of the Janus monolayer, we have studied the gas sensing properties of the Janus NbSeTe monolayer for CO, CO2, NO, NO2, H2S, and SO2 gas molecules using first-principles calculations that will have eminent application in the field of personal security, protection of the environment, and various other industries. We have calculated the adsorption energies and sensing height from the Janus NbSeTe monolayer surface to the gas molecules to detect the binding strength for these considered toxic gases. In addition, considerable charge transfer between Janus monolayer and gas molecules were calculated to confirm the detection of toxic gases. Due to the presence of asymmetric structures of the Janus NbSeTe monolayer, the projected density of states, charge transfer, binding strength, and transport properties displayed distinct behavior when these toxic gases absorbed at Se- and Te-sites of the Janus monolayer. Based on the ultra-low recovery time in the order of μs for NO and NO2 and ps for CO, CO2, H2S, and SO2 gas molecules in the visible region at room temperature suggest that the Janus monolayer as a better candidate for reusable sensors for gas sensing materials. From the transport properties, it can be observed that there is a significant variation of I−V characteristics and sensitivity of the Janus NbSeTe monolayer before and after adsorbing gas molecules demonstrates the feasibility of NbSeTe material that makes it an ideal material for a high-sensitivity gas sensor.

Experimental and density functional theory investigation of Pt-loaded titanium dioxide/molybdenum disulfide nanohybrid for SO2 gas sensing

2019 ◽  
Vol 43 (12) ◽  
pp. 4900-4907 ◽  
Author(s):  
Dongzhi Zhang ◽  
Maosong Pang ◽  
Junfeng Wu ◽  
Yuhua Cao
Keyword(s):  
Density Functional Theory ◽  
Titanium Dioxide ◽  
Molybdenum Disulfide ◽  
Self Assembly ◽  
High Performance ◽  
Density Functional ◽  
Gas Sensing ◽  
Layer By Layer ◽  
Functional Theory ◽  
So2 Gas

A high-performance sulfur dioxide sensor based on a platinum-loaded titanium dioxide/molybdenum disulfide ternary nanocomposite is synthesized via layer-by-layer self-assembly.

π-Bridge modification of thiazole-bridged DPP polymers for high performance near-IR OSCs

2018 ◽  
Vol 20 (3) ◽  
pp. 1664-1672 ◽  
Author(s):  
Kuangshi Sun ◽  
Xiaoqin Tang ◽  
Yalin Ran ◽  
Rongxing He ◽  
Wei Shen ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transport ◽  
Transport Properties ◽  
High Performance ◽  
Intramolecular Charge Transfer ◽  
Energy Levels ◽  
Near Ir

π-Bridge modification could adjust the molecular energy levels and improve the optical, intramolecular charge transfer and charge transport properties.

High-performance NO2-gas sensing of ultrasmall ZnFe2O4 nanoparticles based on surface charge transfer

2019 ◽  
Vol 7 (10) ◽  
pp. 5539-5551 ◽  
Author(s):  
Ke Li ◽  
Yuanyuan Luo ◽  
Bo Liu ◽  
Lei Gao ◽  
Guotao Duan
Keyword(s):  
Charge Transfer ◽  
Surface Charge ◽  
High Performance ◽  
Gas Sensing ◽  
Ex Situ ◽  
Sensing Mechanism ◽  
Znfe2o4 Nanoparticles

Ex situ photoluminescence characterization reveals the gas-sensing mechanism of ZFO NPs to NO2 based on charge transfer.

A simple grinding-calcination approach to prepare the Co3O4–In2O3 heterojunction structure with high-performance gas-sensing property toward ethanol

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105262-105269 ◽  
Author(s):  
Kai Song ◽  
Xiaoqian Meng ◽  
Jianli Zhang ◽  
Yue Zhang ◽  
Xin Wang ◽  
...  
Keyword(s):  
Human Health ◽  
High Performance ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Heterojunction Structure ◽  
Excellent Stability

The development of gas sensing devices with high sensitivity, good selectivity and excellent stability is becoming increasingly important since toxic or harmful gases are a threat to human health.

scholarly journals Reversible Room Temperature H2 Gas Sensing Based on Self-Assembled Cobalt Oxysulfide

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 303
Author(s):  
Hui Zhou ◽  
Kai Xu ◽  
Nam Ha ◽  
Yinfen Cheng ◽  
Rui Ou ◽  
...  
Keyword(s):  
Room Temperature ◽  
Elevated Temperatures ◽  
Gas Sensing ◽  
Low Cost ◽  
High Sensitivity ◽  
Cobalt Sulfide ◽  
Bandgap Energy ◽  
Gas Molecules ◽  
Self Assembled ◽  
P Type

Reversible H2 gas sensing at room temperature has been highly desirable given the booming of the Internet of Things (IoT), zero-emission vehicles, and fuel cell technologies. Conventional metal oxide-based semiconducting gas sensors have been considered as suitable candidates given their low-cost, high sensitivity, and long stability. However, the dominant sensing mechanism is based on the chemisorption of gas molecules which requires elevated temperatures to activate the catalytic reaction of target gas molecules with chemisorbed O, leaving the drawbacks of high-power consumption and poor selectivity. In this work, we introduce an alternative candidate of cobalt oxysulfide derived from the calcination of self-assembled cobalt sulfide micro-cages. It is found that the majority of S atoms are replaced by O in cobalt oxysulfide, transforming the crystal structure to tetragonal coordination and slightly expanding the optical bandgap energy. The H2 gas sensing performances of cobalt oxysulfide are fully reversible at room temperature, demonstrating peculiar p-type gas responses with a magnitude of 15% for 1% H2 and a high degree of selectivity over CH4, NO2, and CO2. Such excellent performances are possibly ascribed to the physisorption dominating the gas–matter interaction. This work demonstrates the great potentials of transition metal oxysulfide compounds for room-temperature fully reversible gas sensing.

Gas Sensing of Monolayer GeSe: A First-Principles Study

NANO ◽  
2019 ◽  
Vol 14 (10) ◽  
pp. 1950131
Author(s):  
Qinqin Zhuang ◽  
Weihuang Yang ◽  
Wei Lin ◽  
Linxi Dong ◽  
Changjie Zhou
Keyword(s):  
Charge Transfer ◽  
First Principles ◽  
Gas Sensing ◽  
Promising Candidate ◽  
Densities Of States ◽  
Paramagnetic Molecules ◽  
Orbital Mixing ◽  
Gas Molecules ◽  
Adsorption Energies ◽  
Transfer Mechanisms

The adsorption of various gas molecules (H2, H2O, CO, NH3, NO and NO[Formula: see text] on monolayer GeSe were investigated by first-principles calculations. The most stable configurations, the adsorption energies, and the amounts of charge transfer were determined. Owing to the appropriate adsorption energies and the non-negligible charge transfers, monolayer GeSe could be a promising candidate as a sensor for NH3, CO, NO and NO2. According to the band structures of the H2O, CO, NH3, NO and NO2 adsorbed systems, the reductions of the bandgaps are caused by the orbital hybridizations between the gas molecules and the underlying GeSe. The partial densities of states reveal the degrees of these orbital hybridizations. The mechanisms of charge transfer are discussed in the light of both traditional and orbital mixing charge transfer theories. The charge transfer of the paramagnetic molecules NO and NO2 could be governed by both charge transfer mechanisms, while for the other gas molecules H2, H2O, CO and NH3, it was most likely determined by the mixing of the HOMO or LUMO with the GeSe orbitals.

A dimethyl methylphonate sensor based on HFIPPH modified SWCNTs

2022 ◽  
Author(s):  
Haiyang Wu ◽  
Yubin Yuan ◽  
Qiang Wu ◽  
Xiangrui Bu ◽  
Long Hu ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Self Assembly ◽  
High Performance ◽  
Gas Sensing ◽  
Detection System ◽  
High Sensitivity ◽  
Assembly Method ◽  
Sensitivity And Selectivity ◽  
Effect Transistor ◽  
Walled Carbon Nanotubes

Abstract In order to meet the requirements of ultra-fast real-time monitoring of sarin simulator with high sensitivity and selectivity, it is of great significance to develop high performance dimethyl methylphonate (DMMP) sensor. Herein, we proposed a DMMP sensor based on p-hexafluoroisopropanol phenyl (HFIPPH) modified self-assembled single-walled carbon nanotubes (SWCNTs) with field effect transistor (FET) structure. The self-assembly method provides a 4 nanometres thick and micron sized SWCNT channel, with high selectivity to DMMP. The proposed SWCNTs-HFIPPH based sensor exhibits remarkably higher response to DMMP than bare SWCNT based gas sensor within only few seconds. The gas sensing response of SWCNTs-HFIPPH based sensor for 1ppm DMMP is 18.2%, and the response time is about 10 seconds. What's more, the gas sensor we proposed here shows excellent selectivity and reproducibility, and the limitation of detection is as low as ppb level. The proposed method lays the foundation for miniaturization and integration of DMMP sensors, expecting to develop detection system for practical sarin sensing application.

scholarly journals Sensing of NO, NO2, and SO2 on two dimensional WS2 doped with Al, P, and Fe: An ab initio study

2020 ◽  
Author(s):  
jiamu cao ◽  
jing zhou ◽  
jianing shi ◽  
yufeng zhang ◽  
junyu chen ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
High Performance ◽  
Density Functional ◽  
Gas Sensing ◽  
Molecular Model ◽  
2D Materials ◽  
State Density ◽  
Two Dimensional ◽  
Gas Molecules

Abstract Owing to their harmful and polluting the environment, nitrogen oxides and sulfur dioxide are expected to monitor when they are used. However, the widespread use of gas sensing methods presents obstacles in terms of portability or stability. Hence, a better detect way needs to be found urgently. The success of graphene-based gas sensors has stimulated interest in two-dimensional (2D) materials in the gas sensing area. Transition metal dichalcogenides (TMDs), such as MoS2 or WS2, are considered to have the high-performance potential for gas sensors. Unfortunately, when used as a gas sensor, the sensing response of the pristine TMDs is greatly affected by a number of gas molecules that are too weak to be detected. Herein, to evaluate the sensing capability of Al, P, and Fe-doped WS2 to NO, NO2, and SO2, the molecular model of the adsorption systems was constructed, and density functional theory (DFT) was used to calculate the adsorption behavior of these gases. The binding force of all the doped-WS2 to the harmful gas molecules is much stronger than that of the pristine WS2. According to the results of adsorption energy, band structure, and state density, Al-doped WS2 has the potential to be used as NO and SO2 gas sensor, while P-doped WS2 is selective to NO. This work opens up a new reference for choosing appropriate doping types on 2D materials for noxious gas sensing.

scholarly journals CHARACTERIZATION OF FUNCTIONALIZED COMPOSITE SWCNT FOR SENSING APPLICATION.

2020 ◽  
pp. 1-3
Author(s):  
Yawar Alamgeer
Keyword(s):  
Charge Transfer ◽  
Surface Area ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Charge Carrier Concentration ◽  
Potential Applications ◽  
Sensitivity And Selectivity ◽  
Gas Molecules ◽  
The Given

It has been seen that an individual carbon nanotube can be bent and tangled within a bundle, increasing the difculty of exfoliation and debundling of SWCNTs aggregates. As the surface area of untangled SWCNTs are quite high as compared to those exist in bundles, efforts have been made to debundle the SWCNTs and make the use of its unique properties. Increase in surface area increases the sensing ability of the CNTs. Since the most common gas sensing principle is the adsorption and desorption of gas molecules on sensing materials, it is quite understandable that by increasing the contact interfaces between the analytes and sensing materials, the sensitivity can be signicantly enhanced. Functionalization can improve the sensitivity and selectivity of the CNTs based gas sensors. Chemical bonds might be used to facilitate the interaction of the nanotube with other analytes such as solvents, polymers and biopolymers matrices. The adsorption of these molecules on the nanotubes is associated with a partial charge transfer, who alters the charge-carrier concentration as the electronic properties of semiconducting CNTs are very sensitive to certain analytes. After interaction with gas molecules and charge transfer, the resulting change in the electrical resistance of the nanotube is utilized as a sensor signal. Functionalization of CNTs with PANI makes it selective towards NH3 gas, with PEI makes it selective towards NO2 gas and HFIP derivatives makes it selective towards DMMP gas. Thus functionalization can provide a better pathway for the CNTs for utilization in potential applications. Further characterization using FTIR and Raman of the given samples were done to ensure the potential of the samples as gas sensor.

Schottky diodes based on 2D materials for environmental gas monitoring: a review on emerging trends, recent developments and future perspectives

2021 ◽  
Author(s):  
Minu Mathew ◽  
Chandra Sekhar Rout
Keyword(s):  
Gas Sensing ◽  
2D Materials ◽  
Schottky Diodes ◽  
High Sensitivity ◽  
Future Perspectives ◽  
Working Temperature ◽  
Emerging Trends ◽  
Gas Sensing Properties ◽  
Recent Developments ◽  
Sensitivity And Selectivity

This review details the fundamentals, working principles and recent developments of Schottky junctions based on 2D materials to emphasize their improved gas sensing properties including low working temperature, high sensitivity, and selectivity.

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