Facile synthesis of ultrathin MnO2 nanobelts anchoring on porous carbon with high oxidase mimetic activity for L-cysteine colorimetric detection

• Published in: Sensors and actuators. B, Chemical Chemical, 2022-06, Vol.361, p.131745, Article 131745
• Main Authors: Feng, Shiya, Wen, Futing, He, Liu, Su, Jiangyu, Jiang, Ping, He, Daiping
• Format: Article
• Language: English
• Subjects: Carbon; Colorimetric detection; Colorimetry; Cysteine; Electroless deposition; Electroless plating; High temperature; L-Cys; Manganese dioxide; MnO2 nanobelt; Nanomaterials; Oxidase; Oxidase-like; Substrates; X ray photoelectron spectroscopy
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2022.131745

MnO2 nanomaterials show remarkable oxidase-like activity as a promising alternative of natural enzyme, but it suffers from complex preparation with the involvement of template or high-temperature hydrothermal procedure. Here, ultrathin MnO2 nanobelts anchoring on porous carbon (MNB/PC) was prepared via a simple electroless deposition under ambient conditions and characterized by XRD, XPS, SEM and TEM. The oxidase-like activity of MNB/PC was evaluated using 3,3′,5,5′-tetramethylbenzidine (TMB) as chromogenic substrate. Under optimal experiment conditions, MNB/PC shows excellent oxidase-like activity with a lower Km and higher Vmax, holding great potential in constructing sensitive colorimetric sensing platform. L-cysteine (Cys) was selected as target molecule to assess the performance of MNB/PC-TMB colorimetric sensing platform, and it shows high-performance and good reliability for Cys detection, even in case of pomegranate juice. This work not only offers a facile and gentle method to synthesize 1D MnO2 nanobelts with “naked” surface, but also sheds light on its oxidase mimetic activity and application for Cys detection. Facile synthesis of ultrathin MnO2 nanobelts anchoring on PC via electroless deposition and the application as a highly efficient oxidase mimic for L-cys detection. [Display omitted] •Ultrathin MnO2 nanobelts were synthesized via a simple and gentle method.•MnO2 nanobelts have large BET specific area and “naked” surface.•MNB/PC shows high performance in triggering TMB oxidation.•A sensitive colorimetric sensing platform was established for L-cys sensitive detection.