One-step Solution Processing of Ag, Au and Pd@MXene Hybrids for SERS

Abstract

We report on one-step hybridization of silver, gold and palladium nanoparticles from solution onto exfoliated two-dimensional (2D) Ti3C2 titanium carbide (MXene) nanosheets. The produced hybrid materials can be used as substrates for surface-enhanced Raman spectroscopy (SERS). An approximate analytical approach is also developed for the calculation of the surface plasmon resonance (SPR) frequency of nanoparticles immersed in a medium, near the interface of two dielectric media with different dielectric constants. We obtained a good match with the experimental data for SPR wavelengths, 440 nm and 558 nm, respectively for silver and gold nanoparticles. In the case of palladium, our calculated SPR wavelength for the planar geometry was 160 nm, demonstrating that non-spherical palladium nanoparticles coupled with 2D MXene yield a broad, significanlty red-shifted SPR band with a peak at 230 nm. We propose a possible mechanism of the plasmonic hybridization of nanoparticles with MXene. The as-prepared noble metal nanoparticles on MXene show a highly sensitive SERS detection of methylene blue (MB) with calculated enhancement factors on the order of 105. These findings open a pathway for extending visible-range SERS applications of novel 2D hybrid materials in sensors, catalysis, and biomedical applications.

Simultaneous Delamination and Rutile Formation on the Surface of Ti3C2Tx MXene for Copper Adsorption

“…However, the UV‐Vis spectra of the His@ d ‐Ti 3 C 2 T x colloidal solution did not show AA absorption bands, because d ‐Ti 3 C 2 T x also exhibits very high broad absorption in the UV region within the range of 220–325 nm. The d ‐Ti 3 C 2 T x colloid also shows a surface plasmon (SP) band in the visible region at 758 nm, suggesting that it has potential in optical spectroscopy applications, such as surface‐enhanced Raman spectroscopy analysis . The SP of d ‐Ti 3 C 2 T x could be explained by the longitudinal oscillations in d ‐Ti 3 C 2 T x flakes in the near‐infrared region …”

MXene‐Based Composites: Synthesis and Applications in Rechargeable Batteries and Supercapacitors

“…For example, Wang and coworkers modified a poly(o-phenylenediamine) (PoPD) with silver nanoparticles (Ag NPs) to form the PoPD/Ag composite as a glucose sensor material. By this method, metal NPs can be deposited on the surface of MXenes from their corresponding precursors, such as AgNO 3 , [216] HAuCl 4 , [59] PdCl 2 , [59] HPtCl 6 , [3] RuCl 3 , [217,218] NiCl 2 , [218] CoCl 2 , [3,217] etc. [214] Zhang et al used density functional theory (DFT) to explore the properties of a Ti/Ti 2 CO 2 composite, which shows better activity than precious metals in catalyzing CO oxidation.…”

“…The effect produces a change of the MXene surface, and the charge distribution will alter. [59,77,197] [232] Some individual MXene-based composites can absorb electromagnetic waves so that the specialized composites materials can be used in the electromagnetic wave absorption apparatus.…”

“…[48] M 3 X 2 T x ratios MXenes have revealed drawbacks such as restacking, easy oxidation, and low electrical conductivity, inhibiting the development of pure M 3 X 2 T x . So far, the MXene-based composites have been successfully synthesized with metals, [59][60][61][62] metal sulfides, [63] metal oxides, [60,64,65] mesoporous carbon, [66,67] graphene, [68] high-quality graphene, [69] carbon nanotubes, [70] carbon fibers, [71,72] polypyrrole, [73] etc., and its applications have been exploited in various fields, for instance, batteries, [74] supercapacitors (SCs), [75] electromagnetic wave absorption, [59,76] water purification, [77] etc. So far, the MXene-based composites have been successfully synthesized with metals, [59][60][61][62] metal sulfides, [63] metal oxides, [60,64,65] mesoporous carbon, [66,67] graphene, [68] high-quality graphene, [69] carbon nanotubes, [70] carbon fibers, [71,72] polypyrrole, [73] etc., and its applications have been exploited in various fields, for instance, batteries, [74] supercapacitors (SCs), [75] electromagnetic wave absorption, [59,…”

2D MXenes as Perspective Immobilization Platforms for Design of Electrochemical Nanobiosensors

“…MXene can be modified by metallic nanoparticles using spontaneous reduction of salts of precious metals (Figures and ) . Jiang et al .…”