Facile patterning of upconversion NaYF4:Yb,Er nanoparticles.
Different kinds of highly ordered patterns of NaYF(4):Yb,Er nanoparticles on gold substrates were fabricated using a simple method combining micro-contact printing and "breath figures" techniques. Ordered arrays of water droplets were first formed in the hydrophilic regions of patterned self-assembled monolayers (SAMs). This was subsequently submerged in a chloroform solution of NaYF(4):Yb,Er nanoparticles. The particles were spontaneously assembled at the interface of chloroform/water droplet surface, leading to different kinds of uniform patterns after solvent evaporation. The structures of NaYF(4):Yb,Er particles patterns depended on the dimension of the substrate, the concentration of the NaYF(4):Yb,Er nanoparticles and the water condensation process.
Department of Materials Science & Engineering, National University of Singapore, Singapore 117540, Republic of Singapore. msesh@nus.edu.sg
Hua-Yan
HY
Si
Du
D
Yuan
Jing-Sheng
JS
Chen
Gan-Moog
GM
Chow
Hao-Li
HL
Zhang