Structural, nanomechanical, field emission and ammonia gas sensing properties of nitrogenated amorphous carbon films deposited by filtered anodic jet carbon arc technique

This paper reports the effect of substrate bias on the structural, nanomechanical, field emission and ammonia gas sensing properties of nitrogenated amorphous carbon films embedded with nanocrystallites (a-C: N: nc) deposited by a filtered anodic jet carbon arc (FAJCA) technique. The films are chara...

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Veröffentlicht in:Talanta (Oxford) 2014-07, Vol.125, p.276-283
Hauptverfasser: Tripathi, R.K., Panwar, O.S., Srivastava, A.K., Rawal, Ishpal, Chockalingam, Sreekumar
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Sprache:eng
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Zusammenfassung:This paper reports the effect of substrate bias on the structural, nanomechanical, field emission and ammonia gas sensing properties of nitrogenated amorphous carbon films embedded with nanocrystallites (a-C: N: nc) deposited by a filtered anodic jet carbon arc (FAJCA) technique. The films are characterized by X-ray diffraction, high resolution transmission electron microscopy, energy dispersive X-ray spectroscopic analysis, Raman spectroscopy, nanoindentation, field emission and ammonia gas sensing measurements. The properties of the films obtained are found to depend on the substrate bias. The maximum hardness (H)=42.7GPa, elastic modulus (E)=330.4GPa, plastic index parameter (H/E)=0.129 and elastic recovery (% ER)=74.4% have been obtained in a-C: N: nc films deposited at −60V substrate bias which show the lowest ID/IG=0.43, emission threshold (ET)=4.9V/µm accompanied with the largest emission current density (Jmax)=1mA/cm2 and field enhancement factor (β)=1805.6. The gas sensing behavior of the a-C: N: nc film has been tested by measuring the change in electrical resistance of the sample in ammonia environment at room temperature with the fast response and recovery time as 29 and 66.9s, respectively. The a-C: N: nc films show enhanced nanomechanical properties accompanied with better field emission behavior and good response and recovery time in ammonia sensing at room temperature. [Display omitted] •a-C: N: nc films were deposited by the filtered anodic jet carbon arc (FAJCA) technique.•Effect of negative substrate bias on the properties of a-C: N: nc films was studied.•Enhanced nanomechanical and field emission properties of a-C: N: nc films have been observed.•Room temperature NH3 gas sensing with fast response and recovery time was observed.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2014.03.005