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Oxidation of single-walled carbon nanotubes in dilute aqueous solutions by ozone as affected by ultrasound

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Abstract.
A clean and simple wet chemical process using dilute aqueous ozone (O3) solution with or without ultrasound (US) was used to functionalize single-walled carbon nanotubes (SWCNTs). Both O3 and O3/US treatments greatly increased the stability of SWCNTs in water. Results of X-ray photoelectron spectroscopy (XPS) showed that the surface oxygen to carbon atomic ratio increased by more than 600% after 72 h of O3 treatment. Moreover,
the effective particle size of SWCNTs was reduced from the initial 4400 to 300 and 150 nm, after 24 h of O3 and O3/US treatment, respectively. The zeta potential of treated SWCNTs decreased from 3.0 to 35.0 mV (at pH 4) after 2 h of treatment with both O3 and O3/US. Based on the XPS results, the oxidation pathway was proposed: at the onset of the oxidation reaction, the C=C double bond was first converted to -C-OH which was
then oxidized to -C=O and O=C-OH concurrently. Oxidation reactions could be described well with first order expressions. Treatment time controlled the extent of surface oxidation and subsequently the stability and dispersion of SWCNTs in water.

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Ketersediaan

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Informasi Detail

Judul Seri

CA R B O N

No. Panggil

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Penerbit

London : Elsevier Ltd.., 2008

Deskripsi Fisik

CA R B O N 4 6 ( 2 0 0 8 ) 4 6 6 –4 7 5

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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