Organically Hybridized SnO<sub>2</sub> Sensors for Selective Detection of Gas Molecules

Matsubara, Ichiro; Hosono, Kouta; Murayama, Norimitsu; Shin, Woosuck; Izu, Noriya

doi:10.1557/proc-785-d14.9

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…Even if most conducting polymers are in their glassy state, swelling cannot be neglected [47,48,49] since inserting analyte molecules into the polymer matrix increases interchain distance, modifying the electron hopping between different polymer chains and ultimately modifying the polymer conductivity.…”

Section: Affinity Of Conducting Polymers To Gases Kinetic and Diffusmentioning

confidence: 99%

Chemiresistive polyaniline-based gas sensors: A mini review

Fratoddi

Venditti

Cametti

et al. 2015

Sensors and Actuators B: Chemical

384

187

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This review focuses on some recent advances made in the field of gas sensors based on polyaniline [PANI], a conducting polymer with excellent electronic conductivity and electrochemical properties. Conducting polymers represent an important class of organic materials with an enhanced resistivity towards external stimuli. Among them, PANI polymers have attracted wide interest because of the versatility in their use, combined with the easy of synthesis, high yield and good environmental stability, together with a favorable response to guest molecules at room temperature. Moreover, PANI can be shaped into various structures with different morphologies and the possibility of obtaining nanofibers, in addition to thin films, has opened a rapid development of ultrasensitive chemical sensors, with improved processability and functionality. This review provides a brief description of the current status of gas chemiresistive sensors based on polyaniline and highlights the properties and applications of these devices in diverse range of application

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Section: Affinity Of Conducting Polymers To Gases Kinetic and Diffusmentioning

confidence: 99%

Chemiresistive polyaniline-based gas sensors: A mini review

Fratoddi

Venditti

Cametti

et al. 2015

Sensors and Actuators B: Chemical

384

187

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“…Semiconducting oxide nanobelts, as one type of singlecrystalline, uniform and stable Q1D nanostructures, are very attractive for chemical and biosensing applications. Among these binary oxide candidates, SnO 2 has long been a technologically important sensor material 16,17 and has been extensively studied in different forms (powder, 18 thin film, 19,20 and hybrid 21,22 ) for gas sensing applications. However, to the best of our knowledge, there has been no report on their Q1D nanoscale counterpart for ion and biomolecular detection in aqueous solutions.…”

mentioning

confidence: 99%

“…Semiconducting oxide nanobelts, as one type of single-crystalline, uniform and stable Q1D nanostructures, are very attractive for chemical and biosensing applications. Among these binary oxide candidates, SnO 2 has long been a technologically important sensor material , and has been extensively studied in different forms (powder, thin film, , and hybrid , ) for gas sensing applications. However, to the best of our knowledge, there has been no report on their Q1D nanoscale counterpart for ion and biomolecular detection in aqueous solutions.…”

mentioning

confidence: 99%

Mechanism and Optimization of pH Sensing Using SnO₂ Nanobelt Field Effect Transistors

Cheng¹,

Xiong²,

Yun³

et al. 2008

Nano Lett.

121

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We report a systematic investigation about the mechanism of pH sensing using SnO 2 nanobelt field effect transistors (FETs). The FETs, based on single SnO 2 nanobelts, are channel-limited and with proper contact passivation; the pH sensing was conducted with sodium phosphate solutions through integrated microfluidics. The responses of the FET channel conductance to pH were measured at different gate voltages: a linear pH dependence was observed in the linear transport "on" state, while an exponential dependence was observed in the subthreshold regime. Measurements at the same pH but different ion concentrations demonstrated that the FET's pH sensitivity decreases logarithmically with the ion concentration. The effect of APTES-functionalization was evaluated by comparing the pH responses of the same device with and without the surface modification. The APTES functionalization results in a slight enhancement of the pH sensitivity and a large suppression of the noise level, leading to marked improvement in the signal-to-noise ratio. The results indicate that the pH sensing is based on a screened field-effect response of the FETs to the surface protonation/ deprotonation on the nanobelt. This study provides several useful guidelines for optimizing the sensor performance for chemical and biomolecular detection.There is significant biomedical interest in developing rapid, portable, high-sensitivity pH sensors for very small amount of fluids. For example, the pH values of blood and interstitial *electronic address: xiong@martech.fsu.edu. Figure 1(a)), which makes it possible to independently bias the FET to obtain optimum sensitivity. Second, the absence of a reference electrode which must be electrically connected to the solution could facilitate applications involving minute amount of fluids such as EBC. NIH Public AccessSemiconducting oxide nanobelts, as one type of single-crystalline, uniform and stable Q1D nanostructures, are very attractive for chemical and biosensing applications. Among these binary oxide candidates, SnO 2 has long been a technologically important sensor material 16,17 and has been extensively studied in different forms (powder, 18 thin film, 19, 20 and hybrid 21,22 ) for gas sensing applications. However, to the best of our knowledge, there has been no report on their Q1D nanoscale counterpart for ion and biomolecular detection in aqueous solutions. Here we report the results of a series of pH sensing experiments with back-gated SnO 2 nanobelt FETs. Our devices employ the conventional MOSFET (metal-oxidesemiconductor field-effect transistor) structure. With a back gate and passivated source/drain electrodes, only the nanobelt channel is exposed to the solution.The catalyst-free synthesis of the oxide nanobelts 23 and the fabrication and characterization of the FET devices have been described in detail previously. 24 In brief, high-performance SnO 2 nanobelt FETs were obtained on individual nanobelts on Si/SiO 2 substrates (degenerately doped n-Si with 100 nm thermal oxide). Cr/Au met...

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