▎ 摘　　要

Schottky barrier with a suitable barrier height which acts as the electron tank can reduce the recombination of photogenerated electronic-hole pairs, consequently leads to higher photoelectric properties. Telluride molybdenum nanoparticles (MoTe2 NPs) are a kind of transition-metal dichalcogenides, which is a burgeoning class of materials with low toxicity, high specific surface area, high carrier mobility, and wide spectral absorption. In order to enhance the photoelectric performance of MoTe2, we adopted a one-step hydrothermal synthesis to construct MoTe2 NPs/reduced graphene oxide (RGO) heterostructures with suitable Schottky barrier. The photocurrent intensity of MoTe2 NPs/RGO heterostructures was 21.8 times of RGO and 10.5 times of MoTe2 NPs. On the basis of excellent visible light-responsive of MoTe2 nanoparticles/RGO, a label-free PEC aptasensor for the detection of profenofos (PRO) was successfully constructed, indicating that MoTe2 nanoparticles/RGO would be a promising visible light-responsive photoactive material for PEC biosensors. This aptasensor exhibited a wide linear range (10(-9) g L-1 and 10(-2) g L-1) and a relatively low detection limit (3.3 x 10(-10) g L-1). At the same time, the application of Schottky barrier in the field of photoelectric sensing was expanded.