
26 Biosensors Based on Nanomaterials and Nanodevices
400 600 800 300
Wavelength (nm)
PL intensity (a.u.)
500 700 300 400 500
(c)(b)
CdTe
CdSe
CdS
UV–Vis
PL
First absorption peak position (nm)
CdSe
8
6
4
2
300 500 700
(e)
8
CdTe
6
4
550
650 750
CdS
6
4
2
200 350
(f)
FIGURE 2.9
UV–visible and PL spectra of the representative NC samples of CdTe (a), CdSe (b) and CdS (c). Sizing curves for
CdTe (d), CdSe (e), and CdS (f) NCs. (Adapted with permission from Yu, W.W., Qu, L., Guo, W., and Peng, X.,
Chem. Mater., 15, 2854–2860. Copyright 2003 American Chemical Society.)
1.0
0.8
0.6
0.4
0.2
0.0
Photoluminescence (normalized)
1200 1400 1600 1800