Ti3C2@Pd nanocatalytic amplification-polypeptide SERS/RRS/Abs trimode biosensoring platformfor ultratrace trinitrotoluene.

A new MXene supported Pd nanoparticles (Ti 3 C 2 @Pd) nanosol with good stability and strong catalysis was prepared by the two-step procedure. Experiment was found that Ti 3 C 2 @Pd could strongly catalyze the reduction of HAuCl 4 by H 2 O 2 to produce gold nanoparticles (AuNPs), with strong surface enhanced Raman scattering (SERS), resonance Rayleigh scattering (RRS) and surface plasmon resonance absorption (Abs). Coupled this new SERS/RRS/Abs trimode nanocatalytic indicator reaction with specific TNT polypeptide (PT TNT), a facile and selective trimode polypeptide biosensoring platform was established for the detection of ultratrace TNT, with a linear range of 1.1–66, 1.1–66 and 4.4–66 pmol/L TNT, and detection limit (DL) of 0.69, 0.97 and 3.36 pmol/L by SERS, RRS and Abs assay respectively. It has been used to detect TNT in wastewater and soil samples, with recovery of 98.7–106% and RSD of 6.22–8.77%. In addition, this biosensoring platform can be also used to assay glyphosate and estradiol, respectively. • MXeneTi 3 C 2 were rapidly prepared by microwave digestion procedure. • Ti 3 C 2 @Pd can strongly catalyze the reduction of HAuCl 4 by H 2 O 2 to produce AuNPs. • A SERS/RRS/Abs trimode biosensoring platform was established coupling AuNPs reaction with polypeptide. • The platform can be used to detect a variety of organic pollutants, such as TNT, GLY and E2. [ABSTRACT FROM AUTHOR]