Ultrasensitive electrochemical biosensor for microRNA-377 detection based on MXene-Au nanocomposite and G-quadruplex nano-amplification strategy

Highly Reliable Chiral Discrimination of Tryptophan Enantiomers through Two Different Modes: Electrochemistry and Temperature

“…The (002) peak shifts toward the low-angle direction on the XRD pattern of MXene, which might be ascribed to the substitution of Al in Ti 3 AlC 2 by F and OH groups during the etching process; on the other hand, the (104) peak disappears almost completely, further confirming successful conversion from Ti 3 AlC 2 to the Ti 3 C 2 T x MXene by etching. , In the case of MXene-AuNPs, the diffraction peaks at 2θ = 38.9, 44.3, 64.5, and 77.5° correspond to the (111), (200), (220), and (311) planes of face-centered-cubic Au single crystals (JCPDS no. 65-2870), respectively, , indicating successful in situ growth of AuNPs on the surface of the MXene nanosheets by the self-reduction method.…”

“…The high-resolution XPS spectra of Au 4f and S 2p are presented in Figure B,C. The double peaks at 86.3 and 82.7 eV are related to Au 4f 5/2 and Au 4f 7/2 , respectively (Figure B), and the binding energy difference of 3.6 eV reveals that the AuNPs in situ grown on MXene exist in the reduced form (Au(0)). , The high-resolution S 2p spectrum can be divided into two peaks at 162.8 and 161.8 eV (Figure C), corresponding to C–S bonds in NALC and Au–S bonds between AuNPs and NALC, respectively …”

“…30,31 In the case of MXene-AuNPs, the diffraction peaks at 2θ = 38.9, 44.3, 64.5, and 77.5°correspond to the (111), ( 200), (220), and (311) planes of face-centered-cubic Au single crystals (JCPDS no. 65-2870), respectively, 23,32 indicating successful in situ growth of AuNPs on the surface of the MXene nanosheets by the self-reduction method. XPS of MXene-AuNPs-NALC.…”

“…As an emerging family of 2D materials, transition metal carbides/nitrides/carbonitrides called MXenes have aroused rapidly increasing attention since their discovery in 2011 by Gogotsi’s group. , Thanks to their distinguishing features such as high electrical conductivity, large specific surface area, and excellent hydrophilicity, MXenes have been widely employed in electrochemical sensing. − Particularly, the transition metal M in MXenes has a strong electron-donating ability since the oxidation number of M in MXenes is much less than that in the metal oxides, and thus, noble metal nanoparticles can be immobilized on the MXenes substrate without the assistance of external reducing agents . On the other hand, MXenes have recently emerged as one of the most promising photothermal transducers due to their outstanding photothermal conversion efficiency, , which opens the window for the design of temperature sensing platforms with MXenes.…”

Facile and Affordable Design of MXene‐Co3O4‐Based Nanocomposites for Detection of Hydrogen Peroxide in Cancer Cells: Toward Portable Tool for Cancer Management

“…[33] Furthermore, MXene can be infused with other nanomaterials to introduce the electrocatalytic activity of H 2 O 2 . [34] In particular, cobalt oxide (Co 3 O 4 ) displays excellent H 2 O 2 electrocatalytic abilities, and its combination with MXene would be powerful for H 2 O 2 determination in biological matrices.…”