Chemosensors, Год журнала: 2025, Номер 13(5), С. 154 - 154

Опубликована: Апрель 22, 2025

Monitoring trace toluene exposure is critical for early-stage lung cancer screening via breath analysis, yet conventional chemiresistive sensors face fundamental limitations, including compromised selectivity in complex VOC matrices and humidity-induced signal drift, with prevailing p–n heterojunction architectures suffering from inherent charge recombination environmental instability. Herein, we pioneer a 2D core–shell n–n strategy through rational design of TiO2@MoS2 heterostructures, where vertically aligned MoS2 nanosheets are epitaxially grown on TiO2 derived graphene-templated synthesis, creating built-in electric fields at the interface that dramatically enhance carrier separation efficiency. At 240 °C, sensor exhibits superior response (Ra/Rg = 9.8 to 10 ppm toluene), outperforming 2.8). Additionally, demonstrates rapid response/recovery kinetics (9 s/16 s), low detection limit (50 ppb), excellent against interfering gases moisture. The enhanced performance attributed unidirectional electron transfer (TiO2 → MoS2) without hole losses, methyl-specific adsorption oxygen vacancy alignment, steric exclusion non-target VOCs size-selective interlayers. This work establishes transformative paradigm gas by leveraging physics synergy, overcoming long-standing limitations architectures.

Язык: Английский