A novel electrochemiluminescence sensor based on nitrogen-doped graphene/CdTe quantum dots composite

Electrochemically Generated versus Photoexcited Luminescence from Semiconductor Nanomaterials: Bridging the Valley between Two Worlds

“…For instance, K + -doped graphene by π conjugation of K + chelators onto the graphene basal plane has been demonstrated to act as an electron-transfer medium and more efficiently promote charge transfer than unmodified graphene . Upon compositing with QDs, K + -doped graphene substantially accelerates charge transfer and promotes the ECL of CdS QDs. , Similarly, the R–O ECL of CdSe QDs composited with N-doped CNTs was 5-times stronger than that of pure QDs and 3-times higher than that composited with undoped CNTs. , …”

“…173,174 Similarly, the R−O ECL of CdSe QDs composited with N-doped CNTs was 5-times stronger than that of pure QDs and 3-times higher than that composited with undoped CNTs. 175,176 Although highly efficient in promoting the ECL of QDs, the strong photoabsorption of carbon nanomaterials (the so-called blackbody effect) and metallic NPs (localized surface plasmon resonance) can also induce ECL quenching. In PL measurement, PL quenching of QDs by either CNT or graphene was frequently reported.…”

A novel electrochemiluminescence sensor for the detection of nitroaniline based on the nitrogen-doped graphene quantum dots

“…It indicated that the proposed ECL route was based on the diazotization reaction occurred among NA, HCl and NaNO 2 . According to recent catalysis researches about GQD and N-GQDs Zhang et al, 2014Zhang et al, , 2015aZhang et al, , 2015bShen et al, 2012;Valizadeh et al, 2015), there had the diazotization reaction of NA on the modified electrode surface with N-GQDs catalyst. As the active mediates, the diazonium product can require faster electron transfer with N-GQDs to generate strong ECL signal.…”

“…Therefore, N-GQDs were capped on electrode surface with chitosan in this study. Using N-GQDs as luminescence label and catalyzer Zhang et al, 2014Zhang et al, , 2015aZhang et al, , 2015bShen et al, 2012;Valizadeh et al, 2015), an ECL enhancement sensing system was designed (Scheme 1). In the sensing system, N-GQDs were capped on electrode surface with chitosan.…”

A sensitive photoelectrochemical biosensor for AFP detection based on ZnO inverse opal electrodes with signal amplification of CdS-QDs

“…The critical challenge for ZnO electrode is the efficient utilization of the visible light. Accordingly, one strategy is the usage of narrow-band-gap QDs, including CdS, CdSe, CdTe, and PbS (Robel et al, 2006;Peter et al, 2002;Robert Plass et al, 2002;Zhang et al, 2014), which can generate multiple electron-hole pairs per photon to improve the efficiency of utilizing visible light (Shen et al, 2011). …”