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Journal ArticleDOI

Enhancing the evanescent field in TiO2/Au hybrid thin films creates a highly sensitive room-temperature formaldehyde gas biosensor.

TL;DR: A highly sensitive surface plasmon resonance (SPR) biosensor that is based on an enhanced evanescent wave technique and can be operated at room temperature (RT) for the detection of formaldehyde is proposed that could be applied to biological monitoring and diagnostics.
About: This article is published in Colloids and Surfaces B: Biointerfaces.The article was published on 2019-10-01. It has received 15 citations till now. The article focuses on the topics: Biosensor.
Citations
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Journal ArticleDOI
TL;DR: In this article, the most recent advances of formaldehyde sensors utilizing metal oxide semiconductors (MOS nanostructures) are summarized and the optimization strategies to enhance the formaldehyde sensor performances are discussed.

42 citations

Journal ArticleDOI
Huafeng Kang1
TL;DR: In this paper , the most recent advances of formaldehyde sensors utilizing metal oxide semiconductors (MOS nanostructures) are summarized and the optimization strategies to enhance the formaldehyde sensor performances are discussed.

42 citations

Journal ArticleDOI
TL;DR: In this paper, the most significant achievements related to TiO2 and TiO 2 combined with carbon structures or noble metals for gas sensor applications are presented, highlighting the synthesis methods employed, the sensor response/recovery times, and some detection mechanisms after the carbon and noble metal insertion.

36 citations

Journal ArticleDOI
TL;DR: In this article , the authors present the sensing mechanism of SnO 2 sensors, and summarize and review the various methodological used to improve the gas sensing performance of the SnO2 based gas sensors, including changing the morphology and structure, doping, and dynamic response and sensor arrays.

30 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented the sensing mechanism of SnO2 sensors, and summarized and reviewed the various methodological used to improve the gas sensing performance of the sensors, including changing the morphology and structure, doping, and dynamic response and sensor arrays.

30 citations

References
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Journal ArticleDOI
TL;DR: A combination of 22 breath VOCs, predominantly alkanes, alkane derivatives, and benzene derivatives, discriminated between patients with and without lung cancer, regardless of stage.

838 citations

Journal ArticleDOI
TL;DR: In this article, the development of colorimetric sensor arrays for the detection of volatile organic compounds is reported, using an array of chemo-responsive dyes, enormous discriminatory power is created in a simple device that can imaged easily with an ordinary flat-bed scanner.

300 citations

Journal ArticleDOI
Seon-Jin Choi1, Inkun Lee1, Bong-Hoon Jang1, Doo-Young Youn1, Won-Hee Ryu1, Chong-Ook Park1, Il-Doo Kim1 
TL;DR: Long-term stability tests revealed that the remarkable selectivity has been maintained after aging for 7 months in air and the superior cross-sensitivity and response to H(2)S and acetone gas offer a potential platform for application in diabetes and halitosis diagnosis.
Abstract: Thin-walled WO3 hemitubes and catalytic Pt-functionalized WO3 hemitubes were synthesized via a polymeric fiber-templating route and used as exhaled breath sensing layers for potential diagnosis of halitosis and diabetes through the detection of H2S and CH3COCH3, respectively. Pt-functionalized WO3 hemitubes with wall thickness of 60 nm exhibited superior acetone sensitivity (Rair/Rgas = 4.11 at 2 ppm) with negligible H2S response, and pristine WO3 hemitubes showed a 4.90-fold sensitivity toward H2S with minimal acetone-sensing characteristics. The detection limit (Rair/Rgas) of the fabricated sensors with Pt-functionalized WO3 hemitubes was 1.31 for acetone of 120 ppb, and pristine WO3 hemitubes showed a gas response of 1.23 at 120 ppb of H2S. Long-term stability tests revealed that the remarkable selectivity has been maintained after aging for 7 months in air. The superior cross-sensitivity and response to H2S and acetone gas offer a potential platform for application in diabetes and halitosis diagnosis.

284 citations

Journal ArticleDOI
TL;DR: Although gas chromatography has been used mainly for the analysis of volatile constituents in breath samples, other techniques have also been used satisfactorily and analytical results can be derived both qualitatively and quantitatively.
Abstract: In this review, we describe technical developments in breath analysis and its applications in clinical diagnosis, monitoring disease state, and assessing environmental exposure. Breath tests have been successfully employed in clinical analyses for symptoms including lung disease, oxidative stress, gastrointestinal disease, metabolic disorders, and Helicobacter pylori infection. Although gas chromatography has been used mainly for the analysis of volatile constituents in breath samples, other techniques (e.g., sensors and lasers) have also been used satisfactorily. The analytical results of breath analysis can be derived both qualitatively and quantitatively. However, evaluation of the data from different approaches remains insufficient because of the lack of standardized procedures and poor methods of validation. Further research is therefore required to expand the applicability of breath analysis in clinical diagnosis of diseases.

281 citations

Journal ArticleDOI
Jian Gong1, Yinhua Li1, Zeshan Hu1, Zhengzhi Zhou1, Yulin Deng1 
TL;DR: In this article, an ultrasensitive nanostructrued sensor that can detect 50 ppt of NH3 gas in air was reported. But the sensor was not shown to be more sensitive than the best PANI sensor reported in the literature.
Abstract: In this communication, we reported for the first time an ultrasensitive nanostructrued sensor that can detect 50 ppt of NH3 gas in air Specifically, nanograins of a p-type conductive polymer, polyaniline (PANI), are enchased on an electrospun n-type semiconductive TiO2 fiber surface The resistance of the p−n heterojunctions combining with the bulk resistance of PANI nanograins can function as electric current switches when NH3 gas is absorbed by PANI nanoparticles As a result, the sensor sensitivity can be significantly improved The sensor fabricated in this work is 1000 times more sensitive than the best PANI sensor reported in the literature

270 citations