Noncovalent Attachment of PbS Quantum Dots to Single- and Multiwalled Carbon Nanotubes

Scheme 1

Energy levels of MWCNT and PbS NP. The bandgap of the semiconductor QD depends on the size. The smaller PbS-QD have a larger bandgap while the larger PbS-QD have a smaller bandgap. Energy values for PbS NP are based on a size of 20 nm for the particle (from [25]). For the size of PbS-QD used for this work, the VB lies at the same energy level shown, while the CB lies at a much higher level. The energy levels shown are not to scale.