Dr. Xiao-Min Lin Profile

Dr. Xiao-Min Lin

at Argonne National Lab

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Proceedings Article | 18 August 2005 Paper

Self-assembly of nanoscale building blocks: an in situ study

Xiao-Min Lin, Suresh Narayanan, Xuefa Li, Jin Wang

Proceedings Volume 5929, 59290E (2005) https://doi.org/10.1117/12.618806

KEYWORDS: Nanocrystals, Interfaces, Superlattices, X-rays, Scattering, Gold, Particles, Chemistry, Chemical species, Molecules

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Building blocks with a nanoscale dimension (typically <100nm) have different properties compared with their bulk counterparts. For instance, the absorption and photoluminescence of semiconductor quantum dots show a strong size dependence [1, 2]. Charge injection onto a single quantum dot has to overcome a strong Coulomb charging energy. The magnetic moment of the surface atoms are strongly enhanced due to unquenched orbital moments in transition metal clusters [3]. Fundamentally, all these new phenomena can be attributed to two major effects on the nanometer scale, namely the quantum confinement of charge and spin [4] and the low coordination of surface atoms [5]. Development in colloidal chemistry during the past two decades has produced a variety of high quality nanoscale building blocks with many unique properties [6-10]. Although it is possible to study and utilize the physical properties of nanoparticles on a single particle level, it remains to be a technically challenging task. On the other hand, experiments on macroscopic 2D and 3D nanocrystal superlattices are more accessible. Self-assembly of nanocrystal building blocks not only provides a way to connect the nanoscale dimension to the macroscopic length scale, but it also creates a revolutionary new class of materials. New collective behavior is expected to emerge because of the strong coupling between building blocks [11, 12].

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