Electrical Transport in Oxide Glasses Containing Gold Nanoparticles

Issa, Ahmed; Küchler, R.; Anavekar, R. V.; Böhmer, Roland; Kanert, O.; Jain, Himanshu

doi:10.1524/zpch.2009.6079

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…Hence the electronic state of the gold must be either Au 0 or Au + . 16 In the present study, ruby colour is observed without adding any reducing agent and heat treatment, and hence, the mechanism of transformation from Au + to Au 0 appears to be complicated. The ac conductivity of the glasses investigated has been found to increase up to ~10 -6 S.cm -1 with the increase of frequency (Fig.…”

Section: Resultsmentioning

confidence: 56%

Ionic to Electronic Conductivity Studies of Lithium-Borate Ruby-Glass-Ceramics Containing Gold Nano Particles

Shivaprakash

Anavekar

2011

Transactions of the Indian Ceramic Society

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Glass-ceramics containing Au nanoparticles have been synthesized in the glass composition 30Li 2 O-70B 2 O 3 with HAuCl 4 .3H 2 O as dopant. The characteristic ruby colour has been observed which is attributed to the surface plasmon resonance of the Au nanoparticles, uniformly embedded in the glass matrix. The imparted red colour due to the presence of gold nanoparticles has been confirmed by studying the optical absorption spectra using UV-VIS spectrometer in the visible range (400-1000 nm) which show a characteristic absorption peak at ~560 nm. In order to check the crystallization/ amorphous nature, the samples were powdered and characterized using X-ray diffraction (XRD). The microstructural modifications in the samples due to the addition of Au have been recorded using scanning electron microscopy (SEM). Further, the electron spin resonance (ESR) studies reveal that the electronic state of gold is either Au 0 or Au + . AC conductivity studies have been performed at room temperature over a frequency range 100 to 10 MHz. The ac conductivity data is fitted by Almond-West law with power exponent 's'. The dc conductivity is found to be increasing with the increase of temperature for a typical ruby glass, but almost constant with dopant concentration.[Keywords : Ruby-glass, Gold nanoparticles, Optical absorption, SPR, Transport properties] IntroductionRuby glasses containing gold nanoparticles or other noble metal nanoparticles have been extensively investigated for the past decades because of their excellent properties such as ultrafast optical response and large third order non-linear susceptibility. [1][2][3][4] This kind of glasses are expected to be promising materials for ultrafast optical switches and optical circuits with micrometer size. Hence, preparation and characterization of materials containing noble metal nanoparticles is the most challenging task for researchers in the area of materials science. Glasses containing metal nanoparticles look very distinctive with different colours. Since the quantum size effects and enhanced surface effects are expected to influence the electronic and optical properties at much smaller particle sizes, it leads to more interest for researchers to fabricate the metal nanoparticles in glasses. 5,6 Such investigated gold-ruby glasses are used not only as decorative glasswares but also for many technological applications in the field of electrical and optical communications. Silicate ruby glasses are synthesized mainly by using HAuCl 4 .3H 2 O along with a reducing agent, such as tin based compounds, and then annealing the glass for several hours at a particular temperature. 7,8 Metal nanoparticles in glasses are also precipitated using electron beam and laser irradiation. In these methods the metal ions are reduced but need thermal treatment.

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Section: Resultsmentioning

confidence: 56%

Ionic to Electronic Conductivity Studies of Lithium-Borate Ruby-Glass-Ceramics Containing Gold Nano Particles

Shivaprakash

Anavekar

2011

Transactions of the Indian Ceramic Society

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“…In these methods the metal ions are reduced but needs thermal treatment [8]. In recent years gold nanoparticles are also fabricated in certain germinate and borate glass matrix [9]. The conductivity studies have been examined as a function of frequency and temperature.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization Studies of Lithium-Borate Ruby Glasses Containing Gold Nanoparticles

Shivaprakash¹,

Anavekar²

2017

Int. J. Res. Granthaalayah

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Glasses containing Au nanoparticles have been synthesized in the base glass of composition 30Li2O–70B2O3 using gold chloride (HAuCl4.3H2O) as a dopant. The characteristic ruby color has been observed which is attributed due to surface plasmon resonance of the Au nanoparticles. The hue of the color increases with the increase of concentration of the dopant. Presence of the gold nanoparticles has been confirmed by studying the optical absorption spectra in the visible range which show a characteristic absorption peak at ~560nm. XRD and SEM studies show that the addition of Au increases the kinetics of growth and crystallization. ESR studies indicate that the electronic state of gold is either Au0 or Au+.

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Electrical Transport in Oxide Glasses Containing Gold Nanoparticles

Cited by 2 publications

References 24 publications

Ionic to Electronic Conductivity Studies of Lithium-Borate Ruby-Glass-Ceramics Containing Gold Nano Particles

Ionic to Electronic Conductivity Studies of Lithium-Borate Ruby-Glass-Ceramics Containing Gold Nano Particles

Fabrication and Characterization Studies of Lithium-Borate Ruby Glasses Containing Gold Nanoparticles

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