Pt-modified carbon nanotube networked layers for enhanced gas microsensors

Penza, M.; Rossi, Riccardo; Alvisi, Marco; Suriano, Domenico; Serra, Emanuele

doi:10.1016/j.tsf.2011.04.178

Cited by 31 publications

(26 citation statements)

References 33 publications

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“…This effect is similar to what has been previously described by Penza et al for Pt‐modified multi‐walled carbon nanotubes (MWCNTs) 28. Moreover, previous studies reported in literature have shown that the size of the metal nanoparticles decorated on the carbon nanotubes influences the sensing properties of the nanomaterials and that in the case of electron withdrawing molecules, the smaller the metal nanoparticles the higher the enhancement in gas sensing 47. PtNBs have a large surface area composed of small ∼5 nm Pt nanoclusters that are interconnected on the surface of a hollow silver nanobox frame, thus, providing a continuous electrical connection to the carbon nanotube sensor material.…”

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confidence: 89%

Hybrid Platinum Nanobox/Carbon Nanotube Composites for Ultrasensitive Gas Sensing

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2013

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A novel gas sensor based on hybrid platinum nanobox/single walled carbon nanotube composites shows improved gas sensing response time and sensitivity towards chlorine detection at room temperature compared to sensors fabricated from pristine carbon nanotubes. The enhanced sensor response is attributed to the improvement of the gas adsorption and charge‐transfer efficiency with the incorporation of Pt nanoboxes.

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confidence: 89%

Hybrid Platinum Nanobox/Carbon Nanotube Composites for Ultrasensitive Gas Sensing

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“…Several methods have been used to functionalize CNTs by metal NPs, such as thermal evaporation (Scarselli et al, 2012), sputtering (Penza et al, 2011) and electrochemical deposition (Mubeen et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection

Dilonardo

Penza

Alvisi

et al. 2014

J. Sens. Sens. Syst.

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Abstract. In the present study, Au-surfactant core-shell colloidal nanoparticles (NPs) with controlled dimension and composition were synthesized by sacrificial anode electrolysis. Transmission electron microscopy (TEM) revealed that Au NPs core diameter is between 8 and 12 nm, as a function of the electrosynthesis conditions. Moreover, surface spectroscopic characterization by X-ray photoelectron spectroscopy (XPS) analysis confirmed the presence of nanosized gold phase. Controlled amounts of Au NPs were then deposited electrophoretically on carbon nanotube (CNT) networked films. The resulting hybrid materials were morphologically and chemically characterized using TEM, SEM (scanning electron microscopy) and XPS analyses, which revealed the presence of nanoscale gold, and its successful deposition on CNTs. Au NP/CNT networked films were tested as active layers in a two-pole resistive NO 2 sensor for sub-ppm detection in the temperature range of 100-200 • C. Au NP/CNT exhibited a p-type response with a decrease in the electrical resistance upon exposure to oxidizing NO 2 gas and an increase in resistance upon exposure to reducing gases (e.g. NH 3 ). It was also demonstrated that the sensitivity of the Au NP/CNT-based sensors depends on Au loading; therefore, the impact of the Au loading on gas sensing performance was investigated as a function of the working temperature, gas concentration and interfering gases.

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“…Here, we demonstrate an improvement in sensitivity and operation temperature of the Pt/SWCNTs sensors, when compared to the work recently published in which Pt/MWCNTs sensors were for the detection of CH 4 (98–5600 ppm) at 120°C. 33 …”

Section: Resultsmentioning

confidence: 99%

Platinum Electrodeposition on Unsupported Single Wall Carbon Nanotubes and Its Application as Methane Sensing Material

Jesus¹,

Santiago²,

Casillas³

et al. 2012

J. Electrochem. Soc.

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This paper reports the decoration of single wall carbon nanotubes (SWCNTs) with platinum (Pt) nanoparticles using an electrochemical technique, rotating disk slurry electrode (RoDSE). Pt/SWCNTs were electrochemically characterized by cyclic voltammetry technique (CV) and physically characterized through the use of transmission electron microscopy (TEM), energy dispersive spectroscopy - X-ray florescence (EDS-XRF) and X-ray diffraction (XRD). After characterization it was found that electrodeposited nanoparticles had an average particle size of 4.1 ± 0.8 nm. Pt/SWCNTs were used as sensing material for methane (CH4) detection and showed improved sensing properties in a range of concentration from 50 ppm to 200 ppm parts per million (ppm) at room temperature, when compared to other Pt/CNTs-based sensors. The use of this technique for the preparation of Pt/SWCNTs opens a new possibility in the bulk preparation of samples using an electrochemical method and thus their potential use in a wide variety of applications in chemical sensing, fuel cell and others.

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Pt-modified carbon nanotube networked layers for enhanced gas microsensors

Cited by 31 publications

References 33 publications

Hybrid Platinum Nanobox/Carbon Nanotube Composites for Ultrasensitive Gas Sensing

Hybrid Platinum Nanobox/Carbon Nanotube Composites for Ultrasensitive Gas Sensing

Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection

Platinum Electrodeposition on Unsupported Single Wall Carbon Nanotubes and Its Application as Methane Sensing Material

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Pt-modified carbon nanotube networked layers for enhanced gas microsensors

Cited by 31 publications

References 33 publications

Hybrid Platinum Nanobox/Carbon Nanotube Composites for Ultrasensitive Gas Sensing

Hybrid Platinum Nanobox/Carbon Nanotube Composites for Ultrasensitive Gas Sensing

Electrophoretic deposition of Au NPs on CNT networks for sensitive NO&lt;sub&gt;2&lt;/sub&gt; detection

Platinum Electrodeposition on Unsupported Single Wall Carbon Nanotubes and Its Application as Methane Sensing Material

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Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection