Journal
SENSORS
Volume 19, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/s19122726
Keywords
methyl paraben; cellulose nanocrystal; reduced graphene oxide; electrochemical sensor
Funding
- Ministry of Higher Education Malaysia
- University Teknologi MARA
- Chemical Sensor and Biosensor UKM [DPP-2018-064]
- [GP-5179-2019]
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A new cellulose nanocrystal-reduced graphene oxide (CNC-rGO) nanocomposite was successfully used for mediatorless electrochemical sensing of methyl paraben (MP). Fourier-transform infrared spectroscopy (FTIR) and field-emission scanning electron microscopy (FESEM) studies confirmed the formation of the CNC-rGO nanocomposite. Cyclic voltammetry (CV) studies of the nanocomposite showed quasi-reversible redox behavior. Differential pulse voltammetry (DPV) was employed for the sensor optimization. Under optimized conditions, the sensor demonstrated a linear calibration curve in the range of 2 x 10(-4)-9 x 10(-4) M with a limit of detection (LOD) of 1 x 10(-4) M. The MP sensor showed good reproducibility with a relative standard deviation (RSD) of about 8.20%. The sensor also exhibited good stability and repeatability toward MP determinations. Analysis of MP in cream samples showed recovery percentages between 83% and 106%. Advantages of this sensor are the possibility for the determination of higher concentrations of MP when compared with most other reported sensors for MP. The CNC-rGO nanocomposite-based sensor also depicted good reproducibility and reusability compared to the rGO-based sensor. Furthermore, the CNC-rGO nanocomposite sensor showed good selectivity toward MP with little interference from easily oxidizable species such as ascorbic acid.
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