Synthesis of CdS nanorods and nanospheres: shape tuning by the controlled addition of a sulfide precursor at room temperatureElectronic supplementary information (ESI) available: Synthesis procedure, absorption and emission spectrum of 1 : 1 CdS 3 and CdS 4, absorption, emission spectrum of 1 : 1 CdS@2TOAB, lifetime decay and constructed decay of 1 : 1 CdS1@1TOAB, lifetime analysis table, tabulated d-spacing values of TOAB and scheme showing the role of TOAB in shape tuning. See DOI: 10.1039/c0c

• Main Authors: Shanmugapriya, T, Vinayakan, R, Thomas, K. George, Ramamurthy, P
• Format: Journal Article
• Language: English
• Published: 07.04.2011
• ISSN: 1466-8033
• DOI: 10.1039/c0ce00374c

Shape tuning of CdS nanocrystals (NCs) by controlled growth and stabilization by tetraoctyl ammonium bromide ligands in non-aqueous medium is thoroughly investigated in this report. CdS nanorods and nanospheres were synthesized by manipulating the addition rate of the sulfide precursor. A higher addition rate (10 mL min −1 ) of the precursor yields nanorods and a lower addition rate (1 mL min −1 ) of the precursor yields nanospheres whereas an addition rate (7 mL min −1 ) in between these two addition rate yields a mixture of nanorods and nanospheres. The investigation further revealed that an optimum concentration of stabilising agent decides the shape, whereas the precursor mole ratio does not play any significant role in shape tuning. The band edge and trap state emission of the NCs synthesized were analysed by time resolved emission studies. Shape tuning of CdS quantum dots stabilized by tetraoctyl ammonium bromide ligands in non-aqueous medium by the controlled addition of a sulfide precursor yielded nanorods and nanospheres.