Pramanik, Sourav and Pal, Sudipto and De, Goutam (2010) Au nanoparticles doped ZrTiO(4) films and hydrogen gas induced Au-plasmon shifting. Journal of Materials Chemistry, 20 (41). pp. 9081-9088. ISSN 0959-9428

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Abstract

Au nanoparticle (NP) doped ZrTiO(4) films were prepared on glass substrates using the sol-gel process and characterized. An increase of annealing temperature of the doped film from 400 to 800 degrees C caused growth of the Au NPs from about 7 nm to 17 nm in size, respectively. The matrix ZrTiO(4) remained amorphous up to 600 degrees C and transformed into highly crystalline (orthorhombic) form at 800 degrees C. The 400 degrees C annealed Au doped amorphous film showed remarkable blue-shifting (10-11 nm) of the Au surface plasmon resonance (Au-SPR) band in H(2) gas (1 and 0.1% in Ar) at 200 degrees C with appreciable enhancement of optical density (OD). The shifting as well as enhancement of OD of Au-SPR can be reversibly switched between H(2) gas (1-0.1%) and air, and found to be repeatable for several cycles. On the contrary, the Au NP doped crystalline ZrTiO(4) film showed less shifting (4-5 nm) of Au-SPR with insignificant difference in OD value after exposure in H(2) gas at 200-350 degrees C. The reversible dynamic responses of the transmittance data of Au-SPR in cases of 400 degrees C annealed films towards H(2) gas and air showed quick response and recovery times at the operating temperature 200 degrees C. Large Au-SPR shifting in H(2) with significant OD enhancement can be related to the increase of electron transfer on Au NPs facilitating through the embedding amorphous ZrTiO(4) medium.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	16 Feb 2012 06:46
Last Modified:	16 Feb 2012 06:46
URI:	http://cgcri.csircentral.net/id/eprint/901

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