Formaldehyde gas sensor with extremely high response employing cobalt-doped SnO2 ultrafine nanoparticles DOI Creative Commons
Shiqiang Zhou,

Huapeng Wang,

Jicu Hu

et al.

Nanoscale Advances, Journal Year: 2022, Volume and Issue: 4(3), P. 824 - 836

Published: Jan. 1, 2022

Formaldehyde is a common carcinogen in daily life and harmful to health. The detection of formaldehyde by metal oxide semiconductor gas sensor an important research direction. In this work, cobalt-doped SnO2 nanoparticles (Co-SnO2 NPs) with typical zero-dimensional structure were synthesized simple hydrothermal method. At the optimal temperature, selectivity response 0.5% Co-doped are excellent (for 30 ppm formaldehyde, Ra/Rg = 163 437). Furthermore, actual minimum detectable concentration 0.5%Co-SnO2 NPs as low 40 ppb, which exceeds requirements for World Health Organization (WHO) guidelines. significant improvement performance can be attributed following aspects: firstly, cobalt doping effectively improves resistance air; moreover, creates more defects oxygen vacancies, conducive adsorption desorption gases. addition, crystal size vastly small has unique physical chemical properties materials. same time, compared other gases tested, strong reducibility, so that it selectively detected at lower temperature.

Language: Английский

Advances in Noble Metal-Decorated Metal Oxide Nanomaterials for Chemiresistive Gas Sensors: Overview DOI Creative Commons

Li‐Yuan Zhu,

Lang‐Xi Ou,

Li‐Wen Mao

et al.

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: April 7, 2023

Abstract Highly sensitive gas sensors with remarkably low detection limits are attractive for diverse practical application fields including real-time environmental monitoring, exhaled breath diagnosis, and food freshness analysis. Among various chemiresistive sensing materials, noble metal-decorated semiconducting metal oxides (SMOs) have currently aroused extensive attention by virtue of the unique electronic catalytic properties metals. This review highlights research progress on designs applications different SMOs nanostructures (e.g., nanoparticles, nanowires, nanorods, nanosheets, nanoflowers, microspheres) high-performance higher response, faster response/recovery speed, lower operating temperature, ultra-low limits. The key topics include Pt, Pd, Au, other metals Ag, Ru, Rh . ), bimetals-decorated containing ZnO, SnO 2 , WO 3 In O Fe CuO), heterostructured SMOs. addition to conventional devices, innovative like photo-assisted room temperature mechanically flexible smart wearable devices also discussed. Moreover, relevant mechanisms performance improvement caused decoration, sensitization effect chemical effect, been summarized in detail. Finally, major challenges future perspectives towards SMOs-based proposed.

Language: Английский

Citations

257
Nanomaterial-based gas sensors used for breath diagnosis DOI
Xinyuan Zhou, Zhenjie Xue, Xiangyu Chen

et al.

Journal of Materials Chemistry B, Journal Year: 2020, Volume and Issue: 8(16), P. 3231 - 3248

Published: Jan. 1, 2020

Gas-sensing applications commonly use nanomaterials (NMs) because of their unique physicochemical properties, including a high surface-to-volume ratio, enormous number active sites, controllable morphology, and potential for miniaturisation.

Language: Английский

Citations

189
Metal-organic frameworks for QCM-based gas sensors: A review DOI
Luyu Wang

Sensors and Actuators A Physical, Journal Year: 2020, Volume and Issue: 307, P. 111984 - 111984

Published: April 9, 2020

Language: Английский

Citations

174
Modeling Interfacial Interaction between Gas Molecules and Semiconductor Metal Oxides: A New View Angle on Gas Sensing DOI Creative Commons
Chenyi Yuan, Junhao Ma, Yidong Zou

et al.

Advanced Science, Journal Year: 2022, Volume and Issue: 9(33)

Published: Sept. 18, 2022

Abstract With the development of internet things and artificial intelligence electronics, metal oxide semiconductor (MOS)‐based sensing materials have attracted increasing attention from both fundamental research practical applications. MOS possess intrinsic physicochemical properties, tunable compositions, electronic structure, are particularly suitable for integration miniaturization in developing chemiresistive gas sensors. During processes, dynamic gas–solid interface interactions play crucial roles improving sensors’ performance, most studies emphasize gas–MOS chemical reactions. Herein, a new view angle focusing more on physical during sensing, basic theory overview latest progress process molecules including adsorption, desorption, diffusion, systematically summarized elucidated. The unique mechanisms also discussed various aspects molecular interaction models, diffusion mechanism, interfacial reaction behaviors, where structure–activity relationship behavior overviewed detail. Especially, surface adsorption–desorption dynamics evaluated, their potential effects performance elucidated regulation perspective. Finally, prospect further directions processes sensors is discussed, aiming to supplement approaches high‐performance

Language: Английский

Citations

99
Microheater Integrated Nanotube Array Gas Sensor for Parts-Per-Trillion Level Gas Detection and Single Sensor-Based Gas Discrimination DOI
Wenying Tang,

Zhesi Chen,

Zhilong Song

et al.

ACS Nano, Journal Year: 2022, Volume and Issue: 16(7), P. 10968 - 10978

Published: July 7, 2022

Real-time monitoring of health threatening gases for chemical safety and human protection requires detection discrimination trace with proper gas sensors. In many applications, costly, bulky, power-hungry devices, normally employing optical sensors electrochemical sensors, are used this purpose. Using a single miniature low-power semiconductor sensor to achieve goal is hardly possible, mostly due its selectivity issue. Herein, we report dual-mode microheater integrated nanotube array (MINA sensor). The MINA can detect hydrogen, acetone, toluene, formaldehyde the lowest measured limits (LODs) as 40 parts-per-trillion (ppt) theoretical LODs ∼7 ppt, under continuous heating (CH) mode, owing nanotubular architecture large sensing area excellent surface catalytic activity. Intriguingly, unlike conventional electronic noses that use arrays discrimination, discovered when driven by pulse (PH) possesses capability multiple through transient feature extraction method. These above features our make them highly attractive distributed networks battery-powered mobile systems chemical/environmental healthcare applications.

Language: Английский

Citations

74
Oxygen Vacancy-Rich Bimetallic Au@Pt Core–Shell Nanosphere-Functionalized Electrospun ZnFe2O4 Nanofibers for Chemiresistive Breath Acetone Detection DOI
Hongchao Zhao, Jing Li, Xiaopeng She

et al.

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(4), P. 2183 - 2193

Published: April 8, 2024

Sensitive and selective acetone detection is of great significance in the fields environmental protection, industrial production, individual health monitoring from exhaled breath. To achieve this goal, bimetallic Au@Pt core–shell nanospheres (BNSs) functionalized-electrospun ZnFe2O4 nanofibers (ZFO NFs) are prepared work. Compared to pure NFs-650 analogue, ZFO NFs/BNSs-2 sensor exhibits a stronger mean response (3.32 vs 1.84), quicker response/recovery speeds (33 s/28 s 54 s/42 s), lower operating temperature (188 273 °C) toward 0.5 ppm acetone. Note that an experimental limit 30 ppb achieved, which ranks among best cases reported thus far. Besides demonstrated excellent repeatability, humidity-enhanced response, long-term stability, selectivity remarkably improved after BNSs functionalization. Through material characterizations DFT calculations, all these improvements could be attributed boosted oxygen vacancies abundant Schottky junctions between NFs BNSs, synergistic catalytic effect BNSs. This work offers alternative strategy realize subppm under high-humidity conditions catering for future requirements noninvasive breath diabetes diagnosis field healthcare.

Language: Английский

Citations

70
Electronic structure and oxygen vacancy tuning of Co & Ni co-doped W18O49 nanourchins for efficient TEA gas sensing DOI
Shah Zeb, Zhen Yang, Riming Hu

et al.

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 465, P. 142815 - 142815

Published: April 6, 2023

Language: Английский

Citations

60
Bimetal PtPd functionalized Bi2MoO6 microspheres for conductometric detection of CO: A combined experimental and theoretical study DOI
Yan Zhang, Linghao Zhu, Cong Qin

et al.

Sensors and Actuators B Chemical, Journal Year: 2023, Volume and Issue: 381, P. 133461 - 133461

Published: Feb. 1, 2023

Language: Английский

Citations

46
Ultrathin two-dimensional materials: New opportunities and challenges in ultra-sensitive gas sensing DOI
Yushu Shi,

Lanxiu Ni,

Zhenming Wang

et al.

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 505, P. 215691 - 215691

Published: Jan. 31, 2024

Language: Английский

Citations

39
Approaches for selectivity improvement of conductometric gas sensors: an overview DOI Creative Commons
Jing Li, Hongchao Zhao, Yanjie Wang

et al.

Sensors & Diagnostics, Journal Year: 2024, Volume and Issue: 3(3), P. 336 - 353

Published: Jan. 1, 2024

Conductometric gas sensors (CGS) have been extensively explored in recent decades owing to easy fabrication and miniaturization, low cost distributable detectability.

Language: Английский

Citations

28