Charge Transfer Driven by Redox Dye Molecules on Graphene Nanosheets for Room-Temperature Gas Sensing

Nanoscale ◽  
2021 ◽  
Author(s):  
Wenbo Liu ◽  
Junwei Zeng ◽  
Yixun Gao ◽  
Hao Li ◽  
Nicolaas Frans de Rooij ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Functional Groups ◽  
Room Temperature ◽  
Gas Sensing ◽  
Graphene Nanosheets ◽  
Dye Molecules ◽  
Transfer Enhancement

Special functional groups to modify the surface of graphene has received much attention since it enables the charge transfer enhancement, thus realizing the gas-sensing at room temperature. In this work,...

The influence of oxygen functional groups on gas-sensing properties of reduced graphene oxide (rGO) at room temperature

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 52339-52346 ◽  
Author(s):  
X. Wang ◽  
X. Li ◽  
Y. Zhao ◽  
Y. Chen ◽  
J. Yu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Functional Groups ◽  
Room Temperature ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Oxygen Functional Groups ◽  
Reduced Graphene ◽  
Gas Sensing Properties

Three methods were used to prepare reduced graphene oxide (rGO) with various ratios of oxygen functional groups, such as –OOH, –OH and CO, to study their effects on the NO2 sensing properties at room temperature.

Enhanced NO2 sensing performance of S-doped biomorphic SnO2 with increased active sites and charge transfer at room temperature

2020 ◽  
Vol 7 (10) ◽  
pp. 2031-2042
Author(s):  
Wenna Li ◽  
Lang He ◽  
Xue Bai ◽  
Lujia Liu ◽  
Muhammad Ikram ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Active Sites ◽  
Room Temperature ◽  
Gas Sensing ◽  
Chemical Bonds ◽  
Sensing Performance

S-Doped biomorphic SnO2 with active S-terminations and S–Sn–O chemical bonds has significantly improved gas sensing performance to NO2 at room temperature.

scholarly journals Investigation of the room temperature gas sensing properties of metal–organic charge transfer complex CuTCNQF4

2016 ◽  
Vol 4 (47) ◽  
pp. 11173-11179 ◽  
Author(s):  
Faegheh Hoshyargar ◽  
Mahnaz Shafiei ◽  
Carlo Piloto ◽  
Nunzio Motta ◽  
Anthony P. O'Mullane
Keyword(s):  
Remote Sensing ◽  
Charge Transfer ◽  
Room Temperature ◽  
Charge Transfer Complex ◽  
Gas Sensing ◽  
Significant Challenge ◽  
Sensing Applications ◽  
Gas Sensing Properties ◽  
Metal Organic ◽  
Remote Sensing Applications

The ability to detect and monitor toxic and greenhouse gases is highly important, however to achieve this at room temperature and allow for remote sensing applications is a significant challenge.

Excited State Charge Transfer in Dyads of ZnO Nanocrystals and Organic or Transition Metal Dyes

2010 ◽  
Vol 1260 ◽  
Author(s):  
Julia E. Saunders ◽  
Adam S. Huss ◽  
Jon Bohnsack ◽  
Kent R. Mann ◽  
David A. Blank ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Room Temperature ◽  
Surface Coverage ◽  
Dye Molecules ◽  
Electron Transfer Mechanism ◽  
Dye Sensitized ◽  
Zno Nanocrystals ◽  
Carboxylate Groups ◽  
Ft Ir ◽  
State Charge

AbstractTo better understand the specific charge transfer events that occur within a dye-sensitized solar cell (DSSC), we synthesized well-defined ZnO:dye dyads. The ZnO nanocrystals were synthesized following literature procedures from zinc acetate and a hydroxide source in ethanol. The absorption onset of the ZnO nanocrystals was observed using UV-vis measurements, from which estimated nanocrystal diameters were determined. At room temperature, the synthesis yielded nanocrystals ranging in diameter from 2-4 nm. Dispersions of ZnO nanocrystals in ethanol were mixed with solutions containing 5΄΄-phenyl-3΄,4΄-di(nbutyl)-[2,2΄:5΄,2΄΄] terthiophene-5-carboxylic acid. Using FT-IR and fluorescence spectroscopy, it was verified that the dye molecules were adsorbed to the ZnO surface via their carboxylate groups while the number of dye molecules adsorbed to the surface was quantified using a combination of techniques. Adsorption isotherms were employed to probe surface coverage of the dye onto the nanocrystals to yield an adsorption equilibrium constant of 1.5 ± 0.2 x 105 M-1. The ability of ZnO nanocrystals to quench the emission of the dye by an electron transfer mechanism was observed and elucidated using ultra-fast laser spectroscopy where the time-scale for electron injection from the dye to the ZnO was determined to be 5.5 ps.

Effect of functional groups on dielectric, optical gas sensing properties of graphene oxide and reduced graphene oxide at room temperature

RSC Advances ◽  
2015 ◽  
Vol 5 (14) ◽  
pp. 10816-10825 ◽  
Author(s):  
T. Kavinkumar ◽  
D. Sastikumar ◽  
S. Manivannan
Keyword(s):  
Heat Treatment ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Room Temperature ◽  
Gas Sensing ◽  
Partial Reduction ◽  
Reduced Graphene ◽  
Gas Sensing Properties ◽  
Optical Gas Sensing

Partial reduction of graphene oxide (GO) was accomplished through heat treatment at 110 and 220 °C. Role of various oxygen functional groups in graphene and their gas sensing and electrical properties at room temperature were reported.

scholarly journals Preparation and Gas Sensing Properties of PANI/SnO2 Hybrid Material

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1360
Author(s):  
Qiaohua Feng ◽  
Huanhuan Zhang ◽  
Yunbo Shi ◽  
Xiaoyu Yu ◽  
Guangdong Lan
Keyword(s):  
Hybrid Material ◽  
Room Temperature ◽  
Tin Dioxide ◽  
Gas Adsorption ◽  
Gas Sensing ◽  
Oxidative Polymerization ◽  
Environmental Pollutants ◽  
Decomposition Temperature ◽  
Benzene Vapor ◽  
Thermo Gravimetric Analyzer

A sensor operating at room temperature has low power consumption and is beneficial for the detection of environmental pollutants such as ammonia and benzene vapor. In this study, polyaniline (PANI) is made from aniline under acidic conditions by chemical oxidative polymerization and doped with tin dioxide (SnO2) at a specific percentage. The PANI/SnO2 hybrid material obtained is then ground at room temperature. The results of scanning electron microscopy show that the prepared powder comprises nanoscale particles and has good dispersibility, which is conducive to gas adsorption. The thermal decomposition temperature of the powder and its stability are measured using a differential thermo gravimetric analyzer. At 20 °C, the ammonia gas and benzene vapor gas sensing of the PANI/SnO2 hybrid material was tested at concentrations of between 1 and 7 ppm of ammonia and between 0.4 and 90 ppm of benzene vapor. The tests show that the response sensitivities to ammonia and benzene vapor are essentially linear. The sensing mechanisms of the PANI/SnO2 hybrid material to ammonia and benzene vapors were analyzed. The results demonstrate that doped SnO2 significantly affects the sensitivity, response time, and recovery time of the PANI material.

Synergistic effects of SnO2 and Au nanoparticles decorated on WS2 nanosheets for flexible, room-temperature CO gas sensing

2021 ◽  
Vol 332 ◽  
pp. 129493
Author(s):  
Jae-Hun Kim ◽  
Jin-Young Kim ◽  
Ali Mirzaei ◽  
Hyoun Woo Kim ◽  
Sang Sub Kim
Keyword(s):  
Room Temperature ◽  
Au Nanoparticles ◽  
Gas Sensing ◽  
Synergistic Effects ◽  
Ws2 Nanosheets ◽  
Co Gas

SnS2/MXene derived TiO2 hybrid for ultra-fast room temperature NO2 gas sensing

2021 ◽  
Author(s):  
Tianding CHEN ◽  
Wenhao YAN ◽  
Ying WANG ◽  
Jinli Li ◽  
Haibo Hu ◽  
...  
Keyword(s):  
Nitrogen Dioxide ◽  
Human Health ◽  
Room Temperature ◽  
Gas Sensing ◽  
Air Pollutant

Nitrogen dioxide (NO2) is a prominent air pollutant that is harmful to both the environment and human health. Conventional NO2 sensors that are designed to operate at room temperature often...

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