V2CTX MXene-based hybrid sensor with high selectivity and ppb-level detection for acetone at room temperature

Abstract

High-performance, room temperature-based novel sensing materials are one of the frontier research topics in the gas sensing field, and MXenes, a family of emerging 2D layered materials, has gained widespread attention due to their distinctive properties. In this work, we propose a chemiresistive gas sensor made from V2CTx MXene-derived, urchin-like V2O5 hybrid materials (V2C/V2O5 MXene) for gas sensing applications at room temperature. The as-prepared sensor exhibited high performance when used as the sensing material for acetone detection at room temperature. Furthermore, the V2C/V2O5 MXene-based sensor exhibited a higher response (S% = 11.9%) toward 15 ppm acetone than pristine multilayer V2CTx MXenes (S% = 4.6%). Additionally, the composite sensor demonstrated a low detection level at ppb levels (250 ppb) at room temperature, as well as high selectivity among different interfering gases, fast response-recovery time, good repeatability with minimal amplitude fluctuation, and excellent long-term stability. These improved sensing properties can be attributed to the possible formation of H-bonds in multilayer V2C MXenes, the synergistic effect of the newly formed composite of urchin-like V2C/V2O5 MXene sensor, and high charge carrier transport at the interface of V2O5 and V2C MXene.

Vanadium Carbide (V2CTx) MXene-Supported Exfoliated g-C3N4 with the Role of Hole Scavenger as a Rapid Electron Transfer Channel for Enhancing Photocatalytic CO2 Reduction to CO and CH4

“…The two obvious V 2p peaks with binding energies 515.4 and 522.3 eV ascribed to the presence of vanadium as V 4+ and for V 5+ peaks are fitted with the binding energies of 517.9 and 524.6 eV. The presence of V 3+ can be ascribed to V 2p peak with binding energy 513.6 eV. ,, The V 2p energy spectrum exhibits a large portion of V 4+ , which is probably due to the presence of V 2 C Figure e presents a high-resolution spectrum of C 1s with binding energies 284.6, 287.3, 287.7, and 288.3 eV, corresponding to C–C, C–O, N–CH, and N–CN, respectively .…”

“…The charge transfer mechanism over the V 2 C/ECN composite could be discussed based on the work function of V 2 C and ECN samples. The work function of V 2 CT x (ϕ = 4.5 eV) is higher than the work function of ECN (3.14 eV), which could promote the transfer of electrons from the ECN to V 2 C-MXene. Previously, a Fermi level of 6.87 eV was obtained for V 2 C, whereas a Fermi level of 7.86 eV was observed for VO 2 , which confirms the transfer of electrons from V 2 C to VO 2 .…”

A novel PEC and ECL bifunctional aptasensor based on V2CTx MXene-derived MOF embedded with silver nanoparticles for selectively aptasensing miRNA-126

“…As V 2 CT x MXene was used as a precursor for the preparation of V-PMOF, the V clusters fastened among the V 2 CT x lattice restrain the single crystal growth, resulting in defects within V-PMOF. 51 As compared, the EPR signal of AgNPs@V-PMOF was significantly higher than that of V-PMOF, demonstrating plenty of element vacancies. The highly defective nanostructure of AgNPs@V-PMOF benefits the improvement of photoabsorption and electron transfer.…”

“…S1c, ESI †) demonstrated a clear lattice fringe with a space of 0.41 nm, which was in line with the (006) plane of V 2 CT x . 51 Further, the high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and the energy-dispersive X-ray spectroscopy (EDS) of V-PMOF (Fig. S1d, ESI †) indicated the coexistence of V, C, N, and O elements with homogeneous distribution within a selected region.…”

Progress and Insights on Graphene and MXene‐based Emerging 2‐Dimensional Conductive Nanomaterials for Fabrication of Flexible Gas Sensors

“…This leads to enhanced electrical conductivity, which is particularly advantageous in applications requiring high electrical conductivity, such as in electronic devices or conductive coatings. On the other hand, MXene has a unique and interesting hybridization method whereby MXene can hybridize with its self-derived metal oxide from oxidation of its own transition metal ions, such as the recently reported Ti 3 C 2 T x /TiO 2 [50] and V 2 CT x /V 2 O 5 [51]. Such a hybridization method based on self-derivation reserves the advantages of nanocomposite without additionally introducing external metal oxide or metal ions.…”