Motlan, and Zhu, Guanghua and Drozdowicz-Tomsia, K. and McBean, K. and Philips, M.R. and Goldys, E.M. (2007) ANNEALING OF ZNS NANOCRYSTALS GROWN BY COLLOIDAL SYNTHESIS. Jurnal Optical Materials, 29 (12). pp. 1579-1583. ISSN 0925-3467

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ZnS nanocrystals (NCs) capped with tetramethylammonium (TMAH) were synthesized from ZnCl2 · 2H2O and thiourea using a wet chemical process. Further treatments of the nanocrystals such as aging, and annealing have been conducted to examine the stability of the grown samples. The X-ray diffraction spectra show that the crystal has a zinc blende structure with particle size of about 2 nm. The evidence of nanocrystalline character is also clear in the UV–Vis absorption that shows an excitonic peak at about 236 nm (5.2 eV) arising from band edge transitions. A photoluminescence emission peak centered at about 450 nm (2.7 eV) is attributed to transitions between shallow donors and Zn+ vacancies. Both absorption and photoluminescence spectra show that sample aging does not affect the characteristics of the sample, possibly due to protection by TMAH capping. Annealing at 700 °C and 900 °C results in the red shift of the photoluminescence.

Item Type: Article
Keywords: Nanocrystals; Annealing; Photoluminescence emission
Subjects: Q Science > QC Physics
Q Science > QC Physics > QC120 Descriptive and Experimental mechanics
Q Science > QC Physics > QC170 Atomic physics. Constitution and properties of matter including molecular physics, relativity, quantum theory, and solid state physics
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam > Fisika
Depositing User: Mrs Harly Christy Siagian
Date Deposited: 21 Aug 2019 07:55

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