Recent Progress on the Development of Chemosensors for Gases

Zhou, Xin; Lee, Song Yi; Xu, Zhaochao; Yoon, Juyoung

doi:10.1021/cr500567r

Cited by 697 publications

(352 citation statements)

References 415 publications

(529 reference statements)

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“…miniaturization, low cost, and simple sensor readout. [ 11,12 ] As with many sensor applications, high sensitivity and selectivity are essential for accurate diagnosis of diseases.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13] Among the various SMO synthetic methods, electrospinning offers a particularly facile and versatile means for synthesizing quasi-1D SMO fi brous nanostructures with controlled morphology and porosity. [14][15][16] Catalytic functionalization of the SMO surfaces turns out to be indispensable for the further enhancement of gas sensitivity and selectivity.…”

Section: Introductionmentioning

confidence: 99%

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WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Choi

Kim

Cho

et al. 2016

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A novel catalyst functionalization method, based on protein-encapsulated metallic nanoparticles (NPs) and their self-assembly on polystyrene (PS) colloid templates, is used to form catalyst-loaded porous WO3 nanofibers (NFs). The metallic NPs, composed of Au, Pd, or Pt, are encapsulated within a protein cage, i.e., apoferritin, to form unagglomerated monodispersed particles with diameters of less than 5 nm. The catalytic NPs maintain their nanoscale size, even following high-temperature heat-treatment during synthesis, which is attributed to the discrete self-assembly of NPs on PS colloid templates. In addition, the PS templates generate open pores on the electrospun WO3 NFs, facilitating gas molecule transport into the sensing layers and promoting active surface reactions. As a result, the Au and Pd NP-loaded porous WO3 NFs show superior sensitivity toward hydrogen sulfide, as evidenced by responses (R(air)/R(gas)) of 11.1 and 43.5 at 350 °C, respectively. These responses represent 1.8- and 7.1-fold improvements compared to that of dense WO3 NFs (R(air)/R(gas) = 6.1). Moreover, Pt NP-loaded porous WO3 NFs exhibit high acetone sensitivity with response of 28.9. These results demonstrate a novel catalyst loading method, in which small NPs are well-dispersed within the pores of WO3 NFs, that is applicable to high sensitivity breath sensors.

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“…miniaturization, low cost, and simple sensor readout. [ 11,12 ] As with many sensor applications, high sensitivity and selectivity are essential for accurate diagnosis of diseases.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Choi

Kim

Cho

et al. 2016

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“…Metal oxide semiconductors (MOS) have attracted considerable interest from many researchers due to their unique properties that allow numerous practical applications [1,2]. Among the MOS, zinc oxide (ZnO) and tin oxide (SnO2) are n-type wide band-gap semiconductors (Eg = 3.2 and 3.6 eV, at 300 K) [4,5].…”

Section: Introductionmentioning

confidence: 99%

ZnO/SnO2 Heterojunctions Sensors with UV-Enhanced Gas-Sensing Properties at Room Temperature

Silva

Lucchini

M’Peko

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Abstract:We report herein the efficiency of microwave-assisted synthesis for obtaining ZnO/SnO2 heterostructures for room-temperature gas-sensing applications. The sensing performances of the traditional oxide materials have been found for applications above 200 °C. However, these temperatures were here reduced to room temperature by considering sensing activity photoactivated by UV light, even for ppb ozone (O3) levels. The heterojunctions exhibited a fast response, total reversibility, and selectivity to oxidizing gases, especially O3 gas. This investigation provides an efficient way to obtain heterostructures exhibiting remarkable properties for practical applications as O3 gas sensor devices.

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“…11 Understanding the role of small molecules such as NO and HNO in biological signal transduction has resulted in important advances in medicine. 12,13 To shed light on the role of HSNO in vivo, sensors are currently being developed to image this elusive molecule. However, the biochemistry (formation, transport, decomposition) of HSNO remains poorly understood and the structure of the molecule has not been determined to date.…”

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confidence: 99%

Spontaneous and Selective Formation of HSNO, a Crucial Intermediate Linking H₂S and Nitroso Chemistries

et al. 2016

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Thionitrous acid (HSNO), a potential key intermediate in biological signaling pathways, has been proposed to link NO and H 2 S biochemistries, but its existence and stability in vivo remains controversial. We establish that HSNO is spontaneously formed in high concentration when NO and H 2 S gases are mixed at room temperature in the presence of metallic surfaces. Our measurements reveal that HSNO is formed by the reaction H 2 S + N 2 O 3 → HSNO + HNO 2 , where N 2 O 3 is a product of NO disproportionation. These studies also suggest that further reaction of HSNO with H 2 S may form HNO and HSSH. The length of the SN bond has been derived to high precision, and is found to be unusually long: 1.84 Å the longest SN bond reported to date for an R-SNO compound. The present structural and, particularly, reactivity investigations of this elusive molecule provide a rm foundation to better understand its potential physiological chemistry and propensity to undergo SN bond clevage in vivo.The intriguing similarities between the biological proles of NO and H 2 S, two important gasotransmitters acting notably as blood pressure mediators, have raised questions about the possibility of`cross-talk' between the two species. 1Such an interaction could explain the surprisingly benecial eects of these signaling molecules as it may allow H 2 S to modulate the availability of NO within the body.2 The vast majority of NO in vivo is bound as S-nitrosothiols (RSNO), a family of molecules well known for their crucial role in response to oxygen deprivation 35 as well as for being important biological reservoir for NO. 6,7 RSNOs are typically formed through the reaction of nitrosylating agents with thiols (RSH), 8 Once formed, RSNOs can also act as nitrosylating agents thus highlighting their role as NO shuttles at the cellular level.The simplest RSNO, thionitrous acid (HSNO), has been proposed to be the product of the reaction between NO and H 2 S; 9 other possible species have been implicated in this cross-talk', including nitrosopersulde (SSNO − ) and Nnitrosohydroxylamine-N -sulfonate.10 Unlike larger RSNOs, HSNO is thought to be able to freely diuse through cell membranes 2 suggesting that it has the ability to transnitrosate proteins removed from the sites where NO is synthesized, and therefore could play a key role in cellular redox regulation.11 Understanding the role of small molecules such as NO and HNO in biological signal transduction has resulted in important advances in medicine. 12,13 To shed light on the role of HSNO in vivo, sensors are currently being developed to image this elusive molecule. However, the biochemistry (formation, transport, decomposition) of HSNO remains poorly understood and the structure of the molecule has not been determined to date. HSNO has been spectroscopically characterized by infrared measurements in low temperature argon matrices.14,15 The molecule was produced from photolysis of HNSO, a low-lying stable structural isomer of HSNO (∆H ≥ 10 kcal/mol, 16 see Supplementary Information). ...

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Recent Progress on the Development of Chemosensors for Gases

Cited by 697 publications

References 415 publications

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

ZnO/SnO2 Heterojunctions Sensors with UV-Enhanced Gas-Sensing Properties at Room Temperature

Spontaneous and Selective Formation of HSNO, a Crucial Intermediate Linking H₂S and Nitroso Chemistries

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Recent Progress on the Development of Chemosensors for Gases

Cited by 697 publications

References 415 publications

WO3 Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

WO3 Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

ZnO/SnO2 Heterojunctions Sensors with UV-Enhanced Gas-Sensing Properties at Room Temperature

Spontaneous and Selective Formation of HSNO, a Crucial Intermediate Linking H2S and Nitroso Chemistries

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Product

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WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Spontaneous and Selective Formation of HSNO, a Crucial Intermediate Linking H₂S and Nitroso Chemistries