Simultaneous Recognition of Dopamine and Uric Acid in the Presence of Ascorbic Acid via an Intercalated MXene/PPy Nanocomposite

Abstract

Two-dimensional (2D) MXenes have shown a great potential for chemical sensing due to their electric properties. In this work, a Ti3C2Tx/polypyrrole (MXene/PPy) nanocomposite has been synthesized and immobilized into a glassy carbon electrode to enable the simultaneous recognition of dopamine (DA) and uric acid (UA) under the interference of ascorbic acid (AA). The multilayer Ti3C2Tx MXene was prepared via the aqueous acid etching method and delaminated to a single layer nanosheet, benefiting the in-situ growth of PPy nanowires. The controllable preparation strategy and the compounding of PPy material remain great challenges for further practical application. A facile chemical oxidation method was proposed to regulate magnitude and density during the forming process of PPy nanowire, which promotes the conductivity and the electrochemical active site of this as-prepared nanomaterial. The MXene/PPy nanocomposite-modified electrode exhibited the selective determination of DA and UA in the presence of a high concentration of AA, as well as a wide linear range (DA: 12.5–125 μM, UA: 50–500 μM) and a low detection limit (DA: 0.37 μM, UA: 0.15 μM). More importantly, the simultaneous sensing for the co-existence of DA and UA was successfully achieved via the as-prepared sensor.

Investigations of 2D Ti 3 C 2 ( MXene )‐ CoCr 2 O 4 nanocomposite as an efficient electrode material for electrochemical supercapacitors

“…where A is the active surface area (cm 2 ), n is the number of electrons transferred, D is the diffusion coefficient (0.76 Â 10 À5 cm 2 s À1 ) at standard temperature and pressure, v is the scan rate, and C is the analyte concentration. The estimated value for MXene is 0.01 cm 2 and for MXene/CoCr 2 O 4 modified electrode is 0.087 cm 2 comparable to glassy carbon electrode area 0.07 cm 2 .…”

“…With an increase in need for sustainable energy reservoirs owing to fast conventional fossil fuels consumption, enormous research activities are being reported in terms of prolonged, highly rated and environment friendly energy storage devices development 1‐4 . For electrochemical energy technology, designing of electrode materials with enhanced efficiency, versatility, better performance in terms of maximum power and energy density and non‐poisonous activity toward environment is necessary 5,6 .…”

2D single- and few-layered MXenes: synthesis, applications and perspectives

“…17a). 139 As-prepared single-layer Ti 3 C 2 T x benefits the in situ growth of polypyrrole nanowires and provides more active electrochemical sites. Further, the experimental findings confirmed that the heterostructures of composites can facilitate the workload of a target contaminant and the efficiency of electron transport.…”

Applications of MXene-Containing Polypyrrole Nanocomposites in Electrochemical Energy Storage and Conversion

“…132−135 Besides, conductive inorganic nanofillers such as MXene have strong conductivity, have a low bandgap, are simple to functionalize, and have a lot of active sites, making it ideal for sensors with high sensitivity and selectivity. 25,136 Therefore, by combining MXene with PPy, You and coworkers 76 developed a chemical sensor for duo identification of dopamine (DA) and uric acid (UA) amidst ascorbic acid (AA) interference. In the presence of a high concentration of AA, the MXene/PPy nanocomposite-modified electrode showed a low detection limit (DA: 0.37 μM, UA: 0.15 μM) as well as a wide linear range (DA: 12.5−125 μM, UA: 50−500 μM) and the selective determination of DA and UA.…”