Highly luminescent mono- and multilayers of immobilized CdTe nanocrystals: controlling optical properties through post chemical surface modification

2008 ◽  
pp. 1641 ◽  
Author(s):  
Takaaki Tsuruoka ◽  
Rena Takahashi ◽  
Toshihiro Nakamura ◽  
Minoru Fujii ◽  
Kensuke Akamatsu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Surface Modification ◽  
Chemical Surface ◽  
Cdte Nanocrystals ◽  
Chemical Surface Modification

Raman and Photoluminescence Spectroscopic Study of 1-Undecene Functionalized Nanodiamonds

2013 ◽  
Vol 1597 ◽  
Author(s):  
Y. Astuti ◽  
N. R. J. Poolton ◽  
L. Šiller
Keyword(s):  
Optical Properties ◽  
Surface Modification ◽  
Structural Disorder ◽  
Surface Enhanced Raman Spectroscopy ◽  
Peak Position ◽  
Raman Signal ◽  
Chemical Surface ◽  
Chemical Surface Modification ◽  
Surface Enhanced Raman ◽  
Optical Applications

ABSTRACTNanodiamond holds great interest in a variety of optical applications, the properties being correlated with surface modification, and the presence of both impurities and defects (contained either on their surface or within the crystal structure). Undecyl-nanodiamond produced by attachment of 1-undecene onto the nanodiamond surface could be a good candidate as a luminescent marker in the future; therefore, understanding of its optical properties is essential. In this work, the optical properties of the acid-purified nanodiamond and undecyl-nanodiamond were characterised using surface enhanced Raman spectroscopy (SERS) and photoluminescence spectroscopy. The results demonstrate that the characteristic diamond Raman signal at 1330 cm-1 was still observed after chemical surface modification, while the signal at ∼1600 cm-1 (attributed to graphite bands) disappeared after the modification. Broad photoluminescence emission is detected in the range 1.5-2.5 eV (500-800 nm), as typically found for isolated nanodiamond; these emission bands became narrower with attachment of 1-undecene as compared to the sample without surface functionalisation. The observed emission could be related to structural disorder on the nanodiamond surface. The temperature dependence of the intensity, peak position and band widths of each sample has been characterised.

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