Positionally defined, binary semiconductor nanoparticles synthesized by scanning probe block copolymer lithography |
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Authors: | Giam Louise R He Shu Horwitz Noah E Eichelsdoerfer Daniel J Chai Jinan Zheng Zijian Kim Dongwoo Shim Wooyoung Mirkin Chad A |
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Affiliation: | Department of Materials Science and Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA. |
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Abstract: | We report the first method for synthesizing binary semiconductor materials by scanning probe block copolymer lithography (SPBCL) in desired locations on a surface. In this work, we utilize SPBCL to create polymer features containing a desired amount of Cd(2+), which is defined by the feature volume. When they are subsequently reacted in H(2)S in the vapor phase, a single CdS nanoparticle is formed in each block copolymer (BCP) feature. The CdS nanoparticles were shown to be both crystalline and luminescent. Importantly, the CdS nanoparticle sizes can be tuned since their diameters depend on the volume of the originally deposited BCP feature. |
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