Preparation of copper oxide in smectites

Nithima Khaorapapong; Nuttaporn Khumchoo; Makoto Ogawa

doi:10.1016/j.clay.2014.11.038

Preparation of copper oxide in smectites

Nithima Khaorapapong^*, Nuttaporn Khumchoo, Makoto Ogawa

^*Corresponding author for this work

Waseda University

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

Copper oxide nanoparticles were prepared in the interlayer spaces of sodium- and cetyltrimethylammonium-smectites by a titration of an aqueous solution of copper nitrate at 70°C in the presence of dispersed smectites. The resulting hybrids were characterized by powder XRD, SEM, TEM, TG-DTA, as well as FT-IR and UV-visible spectroscopies. A massive blue shift (from 490nm to 232-478nm) of the UV-visible absorption observed for the hybrids confirmed the formation of nanometer-sized copper oxide (3-7nm) in the interlayer spaces. A small amount of larger CuO particle with the size of around 0.6-2.9μm formed at the external surface of clay mineral particles. The nature of the broad absorption band (at around 490nm) of pure copper oxide and the hybrids with high copper oxide loading was attributed to the overlapping of the Cu²⁺ to O^2- charge transfer as well as d-d transition of copper oxide. The interactions with smectites played a role in stabilizing and protecting the formed copper oxide nanoparticles.

Original language	English
Pages (from-to)	238-244
Number of pages	7
Journal	Applied Clay Science
Volume	104
DOIs	https://doi.org/10.1016/j.clay.2014.11.038
Publication status	Published - 2015 Feb 1

Keywords

Copper oxide
Optical property
Smectites
Thermal property

ASJC Scopus subject areas

Geochemistry and Petrology
Geology

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10.1016/j.clay.2014.11.038

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title = "Preparation of copper oxide in smectites",

abstract = "Copper oxide nanoparticles were prepared in the interlayer spaces of sodium- and cetyltrimethylammonium-smectites by a titration of an aqueous solution of copper nitrate at 70°C in the presence of dispersed smectites. The resulting hybrids were characterized by powder XRD, SEM, TEM, TG-DTA, as well as FT-IR and UV-visible spectroscopies. A massive blue shift (from 490nm to 232-478nm) of the UV-visible absorption observed for the hybrids confirmed the formation of nanometer-sized copper oxide (3-7nm) in the interlayer spaces. A small amount of larger CuO particle with the size of around 0.6-2.9μm formed at the external surface of clay mineral particles. The nature of the broad absorption band (at around 490nm) of pure copper oxide and the hybrids with high copper oxide loading was attributed to the overlapping of the Cu2+ to O2- charge transfer as well as d-d transition of copper oxide. The interactions with smectites played a role in stabilizing and protecting the formed copper oxide nanoparticles.",

keywords = "Copper oxide, Optical property, Smectites, Thermal property",

author = "Nithima Khaorapapong and Nuttaporn Khumchoo and Makoto Ogawa",

year = "2015",

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day = "1",

doi = "10.1016/j.clay.2014.11.038",

language = "English",

volume = "104",

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journal = "Applied Clay Science",

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T1 - Preparation of copper oxide in smectites

AU - Khaorapapong, Nithima

AU - Khumchoo, Nuttaporn

AU - Ogawa, Makoto

PY - 2015/2/1

Y1 - 2015/2/1

N2 - Copper oxide nanoparticles were prepared in the interlayer spaces of sodium- and cetyltrimethylammonium-smectites by a titration of an aqueous solution of copper nitrate at 70°C in the presence of dispersed smectites. The resulting hybrids were characterized by powder XRD, SEM, TEM, TG-DTA, as well as FT-IR and UV-visible spectroscopies. A massive blue shift (from 490nm to 232-478nm) of the UV-visible absorption observed for the hybrids confirmed the formation of nanometer-sized copper oxide (3-7nm) in the interlayer spaces. A small amount of larger CuO particle with the size of around 0.6-2.9μm formed at the external surface of clay mineral particles. The nature of the broad absorption band (at around 490nm) of pure copper oxide and the hybrids with high copper oxide loading was attributed to the overlapping of the Cu2+ to O2- charge transfer as well as d-d transition of copper oxide. The interactions with smectites played a role in stabilizing and protecting the formed copper oxide nanoparticles.

AB - Copper oxide nanoparticles were prepared in the interlayer spaces of sodium- and cetyltrimethylammonium-smectites by a titration of an aqueous solution of copper nitrate at 70°C in the presence of dispersed smectites. The resulting hybrids were characterized by powder XRD, SEM, TEM, TG-DTA, as well as FT-IR and UV-visible spectroscopies. A massive blue shift (from 490nm to 232-478nm) of the UV-visible absorption observed for the hybrids confirmed the formation of nanometer-sized copper oxide (3-7nm) in the interlayer spaces. A small amount of larger CuO particle with the size of around 0.6-2.9μm formed at the external surface of clay mineral particles. The nature of the broad absorption band (at around 490nm) of pure copper oxide and the hybrids with high copper oxide loading was attributed to the overlapping of the Cu2+ to O2- charge transfer as well as d-d transition of copper oxide. The interactions with smectites played a role in stabilizing and protecting the formed copper oxide nanoparticles.

KW - Copper oxide

KW - Optical property

KW - Smectites

KW - Thermal property

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VL - 104

SP - 238

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JO - Applied Clay Science

JF - Applied Clay Science

ER -

Preparation of copper oxide in smectites

Abstract

Keywords

ASJC Scopus subject areas

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