Cover Illustration
2021, Vol.7 No.3 Thecoverpictureshows that the thermal processing of citric acid and urea
resulted in some relatively minor carbonization and also significant thermally
induced chemical reactions for the formation of molecular dyes and/or
chromophores, which were incorporated with crosslinking into the
“nano-carbon/organic hybrids”. Some of
the molecular dyes and/or chromophores were red/near-IR absorptive and
fluorescent, which prompted erroneous claims of the hybrid samples as
“red/near-IR carbon dots”. More details are discussed in the article by Sun et al. on page 210011.