Influence of surface chemistry on optical, chemical and electronic properties of blue luminescent carbon dots

Abstract

An in-depth spectroscopic study on blue luminescent carbon dots highlights the role of surface chemistry in their physicochemical properties.

Theoretical X-ray absorption spectroscopy database analysis for oxidised 2D carbon nanomaterials

“…The aqueous dispersion of micrometer-sized GO was purchased from Graphenea and the carbon dots were purchased from ACS Materials. 48 Their X-ray absorption spectra were measured in total electron yield mode from a drop-casted sample on a conductive Si substrate. The C K-edge spectra were measured by scanning the samples in the energy range of 276-310 eV in 0.1 eV steps.…”

“…The data was collected at the U49/2 PGM1 beamline of the BESSY II synchrotron radiation source using the LiXEdrom endstation. 48 3 Results and discussion 3.1 Justification of methodology 3.1.1 Size effects. To validate the proposed methodology, we first need to verify that the calculated model molecule sizes are sufficient for distinguishing the three NNN-distinguishable positions basal, bridge and edge.…”

“…The second spectrum was taken from an oxidised CD sample with a lateral size below 10 nm. 48 For both samples the normed experimental XA spectra (black solid lines in Fig. 4 and 5) as well as estimated compositions of the near-edge features using the database are shown.…”

“…Each component consists of several group XA spectra (see ESI † for detailed composition). The spectrum was taken from Ren et al 48 experimental spectra. The selection process was guided along the lines of additional spectroscopic findings, 48 like the presence or absence of characteristic vibrations in the infrared spectrum of the respective sample.…”

“…The spectrum was taken from Ren et al 48 experimental spectra. The selection process was guided along the lines of additional spectroscopic findings, 48 like the presence or absence of characteristic vibrations in the infrared spectrum of the respective sample. Hence, the composition presents the result of complementary methods that may allow for estimation of the relative occurrence of functionalisation patterns in the sample.…”