R Banerjee et al 2000 J. Phys.: Condens. Matter 12 10647 doi:10.1088/0953-8984/12/50/325
R Banerjee1, R Jayakrishnan, R Banerjee and P Ayyub
Show affiliationsThe interrelation between particle size, crystal structure and optical properties in semiconductor quantum dots has elicited widespread interest. We report the first attempt at relating the size-induced transformation from a hexagonal to a cubic structure in CdS nanoparticles to a change in the band gap. CdS nanoparticles with particle size in the 0.7-10 nm range were prepared by chemical precipitation using thiophenol as a capping agent. Whereas the band gap for bulk hexagonal CdS is about 2.5 eV, that for 1 nm cubic CdS nanoparticles was found to be almost 3.9 eV. We also suggest a simple mechanism (based on the periodic insertion of stacking faults) for the transformation from the cubic zinc blende structure to the hexagonal wurtzite structure.
Surfaces, interfaces and thin films
Issue 50 (18 December 2000)
Received 24 August 2000, in final form 25 October 2000
R Banerjee et al 2000 J. Phys.: Condens. Matter 12 10647
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