Laser writing of semiconductor nanoparticles and quantum dots

被引:28
作者
Bertino, MF [1 ]
Gadipalli, RR
Story, JG
Williams, CG
Zhang, G
Sotiriou-Leventis, C
Tokuhiro, AT
Guha, S
Leventis, N
机构
[1] Univ Missouri, Dept Phys, Rolla, MO 65409 USA
[2] Univ Missouri, Dept Chem, Rolla, MO 65409 USA
[3] Univ Missouri, Dept Nucl Engn, Rolla, MO 65409 USA
[4] Univ Missouri, Dept Phys, Columbia, MO 65211 USA
[5] NASA, Glenn Res Ctr, Div Mat, Polymers Branch, Cleveland, OH 44135 USA
关键词
D O I
10.1063/1.1836000
中图分类号
O59 [应用物理学];
学科分类号
摘要
Silica aerogels were patterned with CdS using a photolithographic technique based on local heating with infrared (IR) light. The solvent of silica hydrogels was exchanged with an aqueous solution of the precursors CdNO3 and NH4OH, all precooled to a temperature of 5degreesC. Half of the bathing solution was then replaced by a thiourea solution. After thiourea diffused into the hydrogels, the samples were exposed to a focused IR beam from a continuous wave, Nd-YAG laser. The precursors reacted in the spots heated by the IR beam to form CdS nanoparticles. We lithographed features with a diameter of about 40 mum, which extended inside the monoliths for up to 4 mm. Samples were characterized with transmission electron microscopy and optical absorption, photoluminescence, and Raman spectroscopies. Spots illuminated by the IR beam were made up by CdS nanoparticles dispersed in a silica matrix. The CdS nanoparticles had a diameter in the 4-6 nm range in samples exposed for 4 min to the IR beam, and of up to 100 nm in samples exposed for 10 min. (C) 2004 American Institute of Physics.
引用
收藏
页码:6007 / 6009
页数:3
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