CdS quantum dots (QDs) of 2.5nm were prepared using G4.5 PAMAM dendrimer templates and characterized by HRTEM and EDS. The aging of synthesized QDs stored in the dark at room-temperature was studied through UV-vis and PL spectrophotometer. The width at half-maximum of the peak (WHM) of the UV-vis and PL spectra becomes narrower, meanwhile the PL intensity increases obviously during the first 5d. Afterwards, the WHM gets broader and the PL intensity decreases slowly during the following 6 months. The results suggest that CdS QDs show a size-focusing growth within the first 5d, but a size-defocusing growth in the following 6 months. However, the increment of CdS QDs size is less than 0.3nm, and the decrement of PL intensity is about
22% after 6 months of aging. The excellent resistance to aging of CdS QDs is attributed to the coordination and template effects of PAMAM dendrimers.
CONG Ri-Min
,
LUO Yun-Jun
,
YU Huai-Qing
. Study on the Resistance to Aging of CdS Quantum Dots Encapsulated by PAMAM Dendrimers[J]. Journal of Inorganic Materials, 2008
, 23(2)
: 379
-382
.
DOI: 10.3724/SP.J.1077.2008.00379
[1] Coe S, Woo W K, Bawendi M G, et al. Nature, 2002, 420 (6917): 800--803.
[2] Bruchez M P, Noronne M, Gin P, et al. Science, 1998, 281 (5385): 2013--2016.
[3] Qu L, Peng X. J. Am. Chem. Soc., 2002, 124 (9): 2049--2055.
[4] Ridley B A, Nivi B, Jacobson J M. Science, 1999, 286 (5440): 746--749.
[5] Chan W C W, Nie S. Science, 1998, 281 (5385): 2016--2018.
[6] Talapin D V, Rogach A L, Kornowski A, et al. Nano Letter, 2001, 1 (4): 207--211.
[7] Wu X C, Bitter A M, Kern K. J. Phys. Chem. B, 2005, 109 (1): 230--239.
[8] Crooks R M, Zhao M, Sun L, et al. Acc. Chem. Res., 2001, 34 (3): 181--190.
[9] Lemon B I, Crooks R M. J. Am. Chem. Soc., 2000, 122 (51): 12886--12887.
[10] 丛日敏, 罗运军, 李国平, 等(CONG Ri-Min, et al). 化学学报(Acta Chimica Sinica), 2005, 63 (5): 421--426.
[11] 刘 萍, 房 华, 赵 明, 等(LIU Ping, et al). 无机材料学报(Journal of Inorganic Materials), 2006, 21 (6): 1417--1422.
[12] 崔艳霞. 北京: 北京理工大学硕士学位论文, 2003.
[13] Brus L. J. Phys. Chem., 1986, 90 (12): 2555--2560.
[14] Sugimoto T, et al. Adv. Colloid Interface Sci., 1987, 28 (1): 65--108.
[15] Peng X G, Wickham J, Alivisatos A P. J. Am. Chem. Soc., 1998, 120 (21): 5343--5344.
