A room temperature volatile organic compound sensor with enhanced performance, fast response and recovery based on N-doped graphene quantum dots and poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) nanocomposite

RSC Advances ◽  
2015 ◽  
Vol 5 (71) ◽  
pp. 57559-57567 ◽  
Author(s):  
Jaber Nasrollah Gavgani ◽  
Hamed Sharifi Dehsari ◽  
Amirhossein Hasani ◽  
Mojtaba Mahyari ◽  
Elham Khodabakhshi Shalamzari ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Organic Compound ◽  
Volatile Organic Compound ◽  
Room Temperature ◽  
Graphene Quantum Dots ◽  
Fast Response ◽  
Volatile Organic ◽  
Doped Graphene ◽  
Response And Recovery ◽  
Voc Sensor

A highly efficient VOC sensor based on N-doped graphene quantum dots (N-GQDs)/poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT–PSS) was fabricated at room temperature.

scholarly journals Nickel-Oxide Based Thick-Film Gas Sensors for Volatile Organic Compound Detection

Chemosensors ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 247
Author(s):  
Sai Kiran Ayyala ◽  
James A. Covington
Keyword(s):  
Organic Compound ◽  
Nickel Oxide ◽  
Thick Film ◽  
Volatile Organic Compound ◽  
Sensing Material ◽  
Low Concentrations ◽  
Volatile Organic ◽  
Recovery Times ◽  
Response And Recovery ◽  
Voc Sensor

In this paper, we report on the development of a highly sensitive and humidity-tolerant metal-oxide-based volatile organic compound (VOC) sensor, capable of rapidly detecting low concentrations of VOCs. For this, we successfully fabricated two different thicknesses of nickel oxide (NiO) sensors using a spin-coating technique and tested them with seven different common VOCs at 40% r.h. The measured film thickness of the spin-coated NiO was ~5 μm (S-5) and ~10 μm (S-10). The fastest response and recovery times for all VOCs were less than 80 s and 120 s, respectively. The highest response (Rg/Ra = 1.5 for 5 ppm ethanol) was observed at 350 °C for both sensors. Sensors were also tested in two different humidity conditions (40% and 90% r.h.). The humidity did not significantly influence the observed sensitivity of the films. Furthermore, S-10 NiO showed only a 3% drift in the baseline resistance between the two humidity conditions, making our sensor humidity-tolerant compared to traditional n-type sensors. Thus, we propose thick-film NiO (10 μm) sensing material as an interesting alternative VOC sensor that is fast and humidity-tolerant.

scholarly journals Synthesis and Characterization of Polymeric Graphene Quantum Dots Based Nanocomposites for Humidity Sensing

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Lam Minh Long ◽  
Nguyen Nang Dinh ◽  
Tran Quang Trung
Keyword(s):  
Quantum Dots ◽  
Atmospheric Pressure ◽  
Graphene Quantum Dots ◽  
Composite Films ◽  
Fast Response ◽  
Bulk Heterojunctions ◽  
Humidity Sensing ◽  
Best Value ◽  
Doped Graphene

Graphene quantum dots (GQDs) were synthesized and incorporated with polyethylenedioxythiophene:poly(4-styrenesulfonate) (PEDOT:PSS) and carbon nanotube (CNT) to form a composite that can be used for humidity sensors. The 600 nm thick composite films contained bulk heterojunctions of CNT/GQD and CNT/PEDOT:PSS. The sensors made from the composites responded well to humidity in a range from 60 to 80% at room temperature and atmospheric pressure. With a CNT content of 0.4 wt.% (GPC-1) to 0.8 wt.% (GPC-2) and 1.2 wt.% (GPC-3), the sensitivity of the humidity sensing devices based on CNT-doped graphene quantum dot-PEDOT:PSS composites was increased from 4.5% (GPC-1) to 9.0% (GPC-1) and 11.0% (GPC-2), respectively. The fast response time of the GPC sensors was about 20 s and it was much improved due to CNTs doping in the composites. The best value of the recovery time was found to be of 40 s, for the GPC composite film doped with 1.2 wt.% CNT content.

Novel volatile organic compound (VOC) sensor based on Ag-decorated porous single-crystalline ZnO nanosheets

2016 ◽  
Vol 6 (2) ◽  
pp. 191-197 ◽  
Author(s):  
Yufeng Sun ◽  
Sheng Ge ◽  
Huanhuan Huang ◽  
Hanxiong Zheng ◽  
Zhen Jin ◽  
...  
Keyword(s):  
Organic Compound ◽  
Volatile Organic Compound ◽  
Single Crystalline ◽  
Zno Nanosheets ◽  
Volatile Organic ◽  
Voc Sensor

scholarly journals Volatile organic compound gas sensors based on methylammonium lead iodide perovskite operating at room temperature

RSC Advances ◽  
2020 ◽  
Vol 10 (22) ◽  
pp. 12982-12987 ◽  
Author(s):  
Anafi Nur'aini ◽  
Ilwhan Oh
Keyword(s):  
Organic Compound ◽  
Volatile Organic Compound ◽  
Gas Sensors ◽  
Room Temperature ◽  
Lead Iodide ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Charge Trap ◽  
Volatile Organic ◽  
Methylammonium Lead Iodide

At room temperature, conductivity of methylammonium lead iodide perovskite was increased in the presence of volatile organic compound (VOC) gas, which was interpreted in the context of charge trap passivation mechanism.

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