Details

Autor(en) / Beteiligte

• Palanisamy, Selvakumar
• Velusamy, Vijayalakshmi
• Balu, Sridharan
• Velmurugan, Sethupathi
• Yang, Thomas C.K.
• Chen, Shih-Wen

Titel

Sonochemical synthesis and anchoring of zinc oxide on hemin-mediated multiwalled carbon nanotubes-cellulose nanocomposite for ultra-sensitive biosensing of H2O2

Ist Teil von

• Ultrasonics sonochemistry, 2020-05, Vol.63, p.104917, Article 104917

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• [Display omitted] •A simple sonochemical method has been adopted for the preparation of MWCNT-CNC nanocomposite.•The ZnO NR on MWCNT-CNC nanocomposite has been prepared using a solution based sonochemical approach for the first time.•The MWCNT-CNC/ZnO NR nanocomposite has been used as immobilisation matrix for hemin and construction of H2O2 biosensor.•A lower LOD of 4.0 nM with lower reduction potential of H2O2 has been achieved using MWCNT-CNC/ZnO NR/hemin biosensor.•The practicality of the fabricated biosensor has been validated in milk samples. In this work, the metal oxide and biopolymer nanocomposites on multiwalled carbon nanotubes (MWCNT) were prepared using a simple sonochemical method. The hexagonal nanorods of zinc oxide (ZnO NR) were synthesized by probe sonication (frequency = 20 kHz, amplitude = 50) method and were integrated on ultrasonically functionalized MWCNT-cellulose nanocrystals (MWCNT-CNC) for the first time. The stable hemin bio-composites also were prepared using the bath sonication (37 kHz of frequency, 150 W of power) method, and was used for the selective and ultrasensitive electrochemical detection of H2O2. The UV–Vis spectroscopy studies confirmed the presence of native hemin on MWCNT-CNC/ZnO NR nanocomposite. Cyclic voltammetry studies revealed that an enhanced redox electrochemical behaviour of hemin was observed on hemin immobilised MWCNT-CNC/ZnO NR nanocomposite than that of other hemin modified electrodes. Also, the MWCNT-CNC/ZnO NR/hemin modified SPCE showed 2.3 folds higher electrocatalytic activity with a lower reduction potential (−0.2 V) towards H2O2 than that of other investigated hemin modified electrodes including hemin/MWCNT and hemin/CNC-ZnO. The fabricated biosensor displayed a stable amperometric response (-0.2 V vs Ag/AgCl) in the linear concentration of H2O2 ranging up to 4183.3 µM with a lower detection limit of 4.0 nM.