On the myth of "red/near-IR carbon quantum dots" from thermal processing of specific colorless organic precursors.

ABSTRACT: Carbon dots were originally found and reported as surface-passivated small carbon nanoparticles, where the effective surface passivation was the chemical functionalization of the carbon nanoparticles with organic molecules. Understandably, the very broad optical absorptions of carbon dots are largely the same as those intrinsic to the carbon nanoparticles, characterized by progressively decreasing absorptivities from shorter to longer wavelengths. Thus, carbon dots are generally weak absorbers in the red/near-IR and correspondingly weak emitters with low quantum yields. Much effort has been made on enhancing the optical performance of carbon dots in the red/near-IR, but without meaningful success due to the fact that optical absorptivities defined by Mother Nature are in general rather ine

SUBMITTER: Liang W 

PROVIDER: S-EPMC9419825 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature