npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
Qrcode

Article

Research Paper

New Physics: Sae Mulli 2017; 67: 903-908

Published online August 31, 2017 https://doi.org/10.3938/NPSM.67.903

Copyright © New Physics: Sae Mulli.

Dependence of the Surface Chemistry of Cu-oxide Nanoparticles on the Particle Size and Shape

크기와 형태에 따른 Cu 산화물 나노 입자의 촉매 반응성 연구

Jiwoong KIM1, Sungkyun PARK*1, Hyunje WOO2, Kang Hyun PARK†2, Jong-Seong BAE3

1 Department of Physics, Pusan National University, Busan 46241, Korea
2 Department of Chemistry, Pusan National University, Busan 46241, Korea
3 Busan Center, Korea Basic Science Institute, Busan 46742, Korea

Correspondence to:*psk@pusan.ac.kr, †chemistry@pusan.ac.kr

Received: June 16, 2017; Revised: July 17, 2017; Accepted: July 17, 2017

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

We investigated the catalytic activity of Cu-oxide nanoparticles of various particle sizes and shapes synthesized by using a one-pot polyol process. Cu-oxide nanoparticles formed at a high reaction temperature (240 $^\circ$C) had spherical shapes while those formed at relatively low reaction temperatures (200 $^\circ$C and 220 $^\circ$C) had cubic shapes. The crystal structure determined from X-ray diffraction measurements was metallic Cu for Cu nano-spheres and Cu$_2$O for Cu nano-cubes. However, X-ray photoelectron spectroscopy confirmed that all Cu-oxide nanoparticles were covered with CuO. Cu-oxide nanoparticles with crystalized CuO on the surface showed enhanced catalytic activity.

Keywords: Cu-oxide nanoparticle, Catalyst, Surface crystallization

단일 용기 폴리올 (one-pot polyol) 과정을 이용하여 다양한 형태와 크기의 Cu 산화물 나노 입자 (Cu-oxide nanoparticle)를 제작하였으며, 각각의 촉매 반응을 측정하였다. 제작된 Cu 산화물 나노 입자는 반응 온도에 따라 저온 (200 $^\circ$C, 220 $^\circ$C)에서 정육면체 형태가 고온 (240 $^\circ$C)에서는 구 형태가 형성되었다. X-선 회절 측정으로부터, 나노 구 형태의 입자는 금속 Cu의 결정구조를 이루고 있으며, 나노 정육면체는 Cu$_2$O의 결정구조를 이루고 있음을 확인하였다. 하지만 X-선 광전자 분광 분석 결과 모든 시료의 표면에는 Cu 산화물이 존재함을 알 수 있었다. 표면에 결정화된 CuO 산화층을 갖는 Cu 산화물 나노 입자에서 더 높은 촉매 반응성을 나타내는 것을 확인하였다.

Keywords: Cu 산화물 나노 입자, 촉매, 표면 결정성

Fig. 1. Scanning and transmission electron microscopic images of Cu nano-spheres (S85 and S60), and Cu nano-cubes (C94 and C57).

Stats or Metrics

Share this article on :

Related articles in NPSM