Electrocatalytic Activity of Molybdenum Disulfide Nanosheets Enhanced by Self-Doped Polyaniline for Highly Sensitive and Synergistic Determination of Adenine and Guanine

Abstract

Recently, easy, green, and low-cost liquild exfoliation of bulk materials to obtain thin-layered nanostructure significantly emerged. In this work, thin-layered molybdenum disulfide (MoS2) nanosheets were fabricated through intercalation of self-doped polyaniline (SPAN) to layer space of bulk MoS2 by ultrasonic exfoliating method to effectively prevent reaggregation of MoS2 nanosheets. The obtained hybrid showed specific surface area, a large number of electroactive species, and open accessible space, accompanied by rich negative charged and special conjugated structure, which was applied to adopt positively charged guanine and adenine, based on their strong π-π* interactions and electrostatic adsorption. Also, the SPAN-MoS2 interface exhibited the synergistic effect and good electrocatalytic activity compared with the sole SPAN or MoS2 modified electrode.

Fe2V4O13 Nanoparticles Based Electrochemical Sensor for the Simultaneous Determination of Guanine and Adenine at Nanomolar Concentration

“…The improved analytical response of the proposed sensor is due to the catalytic effect of Fe 2 V 4 O 13 NPs , which intern enhance the surface area of the composite material on the electrode surface and also provides a feasible pathway for the electron transfer between the electrode interfaces to the bulk of the electrolytic solution . The active surface area of the electrode, calculated based on Randles‐Sevcik relation , is found to be 0.092 cm 2 and 0.127 cm 2 for unmodified CPE and Fe 2 V 4 O 13 NPs/CPE respectively.…”

Recent Advances in Sensing Applications of Two‐Dimensional Transition Metal Dichalcogenide Nanosheets and Their Composites

“…Generally, the hybridization of 2D TMD nanosheets with conducting polymers is obtained by simply mixing the conducting polymers with 2D TMD nanosheets, or their precursors, in which the conducting polymers can be coated on the surface of 2D TMD nanosheets via weak non‐covalent chemical bonding or physical adsorption . For example, Yang et al developed a simple technique for the preparation of polyaniline (PANI)‐coated MoS 2 nanosheets, referred to as MoS 2 –PANI, by direct sonication‐exfoliation of MoS 2 bulk powders with PANI . The obtained hybrid exhibited large surface area, more accessible active sites, and excellent conductivity, which could be used for sensitive detection of adenine and guanine.…”

Two-dimensional transition metal dichalcogenide nanomaterials for biosensing applications

“…In addition, the self-doped polyanilinedecorated MoS 2 exhibited a good electrocatalytic activity for the detection of guanine and adenine compared with the sole polyaniline or MoS 2 . 112 In Table 2, the sensing performances of small molecules based on different 2D TMD nanomaterials are summarized.…”