Pt- and Pd-nanoclusters functionalized carbon nanotubes networked films for sub-ppm gas sensors

Penza, M.; Rossi, Riccardo; Alvisi, Marco; Cassano, G.; Signore,; Serra, Emanuele; Giorgi, R.

doi:10.1016/j.snb.2008.08.024

Cited by 121 publications

(66 citation statements)

References 37 publications

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“…it was reduced to 0.92 and 0.54 eV for Pd 4 /SWCNT pristine and Pd 4 /SWCNT func , respectively). A similar extent of partial charge transfer, about 0.57-0.60 eV, was observed in both cases, which can be ascribed to the electronic reorganization caused by the interaction of the SWCNT and a high work function metal such as Pd [48,49]. That is, the presence of the 4d electrons of Pd in the antibonding orbitals of the nanotube leads to an enhancement of the electron density in the nanotube, and, consequently, a smaller energy gap [50].…”

Section: Dft Calculation For Pd 4 Adsorption On the Pristine And Funcsupporting

confidence: 58%

Anchoring Pd nanoclusters onto pristine and functionalized single-wall carbon nanotubes: A combined DFT and experimental study

Prasomsri

Shi

Resasco

2010

Chemical Physics Letters

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Section: Dft Calculation For Pd 4 Adsorption On the Pristine And Funcsupporting

confidence: 58%

Anchoring Pd nanoclusters onto pristine and functionalized single-wall carbon nanotubes: A combined DFT and experimental study

Prasomsri

Shi

Resasco

2010

Chemical Physics Letters

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“…The gas feeding rate was fixed at 500 sccm in all cases. The sensitivity of the gas sensor (S) is expressed as follows [27,28]: (1) where R 0 is the resistance due to the air and R g is the resistance measured upon exposure to the NH 3 gas. The setup of the gas sensor system is depicted in Fig.…”

Section: Measurement Of the Gas Sensitivitymentioning

confidence: 99%

Preparation and characteristics of conducting polymer-coated multiwalled carbon nanotubes for a gas sensor

Jang¹,

Yun²,

Kim

et al. 2011

Carbon letters

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Conducting polymer-coated multiwalled carbon nanotubes (MWCNTs) were prepared by template polymerization in order to enhance their gas sensitivity. This investigation of the conducting polymer phases that formed on the surface of the MWCNTs is based on field-emission scanning electron microscopy images. The thermal stability of the conducting polymer-coated MWCNTs was significantly improved by the high thermal stability of MWCNTs. The synergistic effects of the conducting polymer-coated MWCNTs improve the gas-sensing properties. MWCNTs coated with polyaniline uniformly show outstanding improvement in gas sensitivity to NH 3 due to the synergistic combination of efficient adsorption of NH 3 gas and variation in the conduction of electrons.

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“…4). The sensitivity of gas sensor is expressed by [18,19] S(%) (1) where R i is the resistance in N 2 gas and R g is the resistance measured upon exposure to NO gas molecules. The CF sample showed resistive response of only a 0.8% due to the inactive NO gas adsorption sites and because it is a nonporous material, as shown in Fig.…”

Section: Gas Sensing By Resistive Responsementioning

confidence: 99%

Improved Sensitivity of an NO Gas Sensor by Chemical Activation of Electrospun Carbon Fibers

Kang¹,

Sun²,

Lee

2011

Carbon letters

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A novel electrode for an NO gas sensor was fabricated from electrospun polyacrylonitrile fibers by thermal treatment to obtain carbon fibers followed by chemical activation to enhance the activity of gas adsorption sites. The activation process improved the porous structure, increasing the specific surface area and allowing for efficient gas adsorption. The gas sensing ability and response time were improved by the increased surface area and micropore fraction. High performance gas sensing was then demonstrated by following a proposed mechanism based on the activation effects. Initially, the pore structure developed by activation significantly increased the amount of adsorbed gas, as shown by the high sensitivity of the gas sensor. Additionally, the increased micropore fraction enabled a rapid sensor response time due to improve the adsorption speed. Overall, the sensitivity for NO gas was improved approximately six-fold, and the response time was reduced by approximately 83% due to the effects of chemical activation.

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Pt- and Pd-nanoclusters functionalized carbon nanotubes networked films for sub-ppm gas sensors

Cited by 121 publications

References 37 publications

Anchoring Pd nanoclusters onto pristine and functionalized single-wall carbon nanotubes: A combined DFT and experimental study

Anchoring Pd nanoclusters onto pristine and functionalized single-wall carbon nanotubes: A combined DFT and experimental study

Preparation and characteristics of conducting polymer-coated multiwalled carbon nanotubes for a gas sensor

Improved Sensitivity of an NO Gas Sensor by Chemical Activation of Electrospun Carbon Fibers

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