Controlled assembly of FePt nanoparticles monolayer on solid substrates

Ying Wang; Minglai Yang; Bin Xu; Zhi Yang; Nantao Hu; Liangming Wei; Bingchu Cai; Yafei Zhang

doi:10.1016/j.jcis.2013.11.027

Controlled assembly of FePt nanoparticles monolayer on solid substrates

J Colloid Interface Sci. 2014 Mar 1:417:100-8. doi: 10.1016/j.jcis.2013.11.027. Epub 2013 Nov 19.

Authors

Ying Wang¹, Minglai Yang², Bin Xu³, Zhi Yang³, Nantao Hu³, Liangming Wei³, Bingchu Cai³, Yafei Zhang³

Affiliations

¹ Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Institute of Micro and Nano Science and Technology, Shanghai Jiaotong University, Shanghai 200240, China. Electronic address: wangying@sjtu.edu.cn.
² Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, China. Electronic address: yangml@sari.ac.cn.
³ Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Institute of Micro and Nano Science and Technology, Shanghai Jiaotong University, Shanghai 200240, China.

PMID: 24407664
DOI: 10.1016/j.jcis.2013.11.027

Abstract

The surface wettability is one of the most important factors to control the morphology of nanoparticle arrangement on the solid substrates. The various morphologies of FePt nanoparticles were fabricated on different substrates with different wetting surfaces by the Langmuir-Blodgett (LB) technology at large scale. A highly ordered structure and a dense arrangement of FePt nanoparticle monolayer were obtained on different substrates with contact angle up to 66°. The air pockets could be presented between the nanoparticles and solid substrate by theoretical analysis, because FePt nanoparticles had hydrophobic surface. A net structure of FePt nanoparticles on solid substrates could be also obtained by controlling about 45° contact angles of their surfaces. This method potentially opens up a new approach to controlling assembly of nanoparticle monolayer on solid substrates by change of the wettability on the surfaces of solid substrate and provides a promising thin film which may exhibit the excellent ultra high density magnetic recording properties.

Keywords: Assembly; Controlled; Nanoparticle monolayer; Wettability.