148 Nanosensors: Physical, Chemical, and Biological
use epitaxially grown QDs for in situ biosensing, mainly due to the ease of
detection.
QD synthesis can be tailored to meet specic requirements, with core,
shell, and coating characteristics all affecting photochemical properties. QDs
may be manufactured with diameters ranging between broad limits starting
from a few nanometers to as large as a few micrometers. Size distributions
are controllable within 2% using accurate growth techniques, involving high
annealing temperatures (Jamieson et al. 2007).
3.2.3.1 CdSe/ZnS Core/Shell QDs
CdSe–ZnS core/shell QDs are prepared using synthetic techniques involv-
ing growth and annealing of organometallic precursors at high temperature.
The ...