One-step electrochemical synthesis of ultrathin graphitic carbon nitride nanosheets and their application to the detection of uric acid

Abstract

Ultrathin graphitic carbon nitride nanosheets (g-C3N4) with a thickness of about 2 nm were synthesized by a one-step electrochemical method for the first time. The possible mechanism of the electrochemical synthesis was discussed. This as-synthesized g-C3N4 showed intrinsic peroxidase-like activity and was successfully applied for the detection of uric acid.

Enhancement of the Intrinsic Peroxidase-Like Activity of Graphitic Carbon Nitride Nanosheets by ssDNAs and Its Application for Detection of Exosomes

“…23,24 Like other carbon nanomaterials, g-C 3 N 4 NSs were found to possess intrinsic peroxidase-like activity and employed for the detection of glucose in serum or uric acid in urine. 25,26 Furthermore, just like other nanomaterials, 27–29 this material has been demonstrated to selectively adsorb single-stranded DNA (ssDNA) but not double-stranded DNA (dsDNA), which can be combined with their ability to quench fluorophores to design fluorescence sensors for nucleic acids. 30 …”

Reduced-sized monolayer carbon nitride nanosheets for highly improved photoresponse for cell imaging and photocatalysis

“…In particular, due to many advantages of easy operation, low-cost, environmental benignity, and no reason for interfacial defects, liquid-phase exfoliation, usually in conjunction with ultrasonic treatment has been intensively explored for producing ultrathin GCNNs by delaminating bulk GCN [28,31,32]. However, the obtained GCNNs usually have a thickness larger than 2 nm (> 5 layers) [30,33]. It is still a challenge to prepare atom-thin GCNN with a reduced lateral size (<100 nm) although several research groups have recently reported the preparation of monolayer GCNN that has a lateral dimension larger than 1.0 μm [13,34].…”

“…Thus far, GCNNs prepared with various techniques, such as mechanical milling [24,25], chemical oxidation thermal or etching [20,26,27], physical and liquid exfoliation [22,28,29], and electrochemical synthesis [30] usually show wide distributions in both the number of layers and lateral size. In particular, due to many advantages of easy operation, low-cost, environmental benignity, and no reason for interfacial defects, liquid-phase exfoliation, usually in conjunction with ultrasonic treatment has been intensively explored for producing ultrathin GCNNs by delaminating bulk GCN [28,31,32].…”

Amino‐functionalized material from a bio‐template for silver adsorption: process evaluation in batch and fixed bed

“…For the series of adsorbents functionalized with melamine, spectra were similarly analyzed, although the nitrogen region presents significant differences when compared with the adsorbents functionalized with urea; for this reason, the spectrum was deconvoluted into three peaks. The first at 398.5 eV is assigned to aromatic N atoms with sp 2 hybridization bonded to C atoms, whereas the peak at 399.7 eV corresponds to tertiary N atoms bonded to C atoms as H 2 N–C. Finally, the peak at 400.8 eV may be due to the presence of amino groups as ammonium NH 3 + in the adsorbent surface .…”

“…The first at 398.5 eV is assigned to aromatic N atoms with sp 2 hybridization bonded to C atoms, whereas the peak at 399.7 eV corresponds to tertiary N atoms bonded to C atoms as H 2 N–C. Finally, the peak at 400.8 eV may be due to the presence of amino groups as ammonium NH 3 + in the adsorbent surface . The contribution of melamine in the carbon region, however, becomes impossible to distinguish because the contribution from polyphenolic compounds (C–OH, O=C–OH) present in the modified bio‐template is greater in proportion.…”