By: Wan Mohd Ebtisyam Mustaqim Mohd Daniyal, Yap Wing Fen, Jaafar Abdullah, Ahmad Ashrif A. Bakar, Mohd Adzir Mahdi

Highlights

• Nanocrystalline cellulose-graphene oxide-ionophore thin film was developed
• The thin film was for Cu2+ detection using plasmonic based optical sensor.
• Sensitive detection of Cu2+ as low as 0.001 ppm was obtained.
• High selectivity was demonstrated for Cu2+ detection in spiked river water.

Abstract

In this work, a highly sensitive and selective surface plasmon resonance (SPR) sensor has been developed using nanocrystalline cellulose-graphene oxide-ionophore (NCC-GO-ionophore) for copper ion (Cu2+) detection. By incorporating SPR with nanocrystalline cellulose-graphene oxide-ionophore (NCC-GO-ionophore) thin film, Cu2+ was able to be detected as low as 0.001 ppm until 0.1 ppm. Moreover, the results show that the NCC-GO-ionophore thin film has good sensitivity towards Cu2+, with a sensitivity value of 59.9150° ppm−1 from 0.001 to 0.01 ppm and 2.2261° ppm−1 from 0.01 to 0.1 ppm. Besides that, the developed sensor also shows a high affinity towards Cu2+ compared to other metal ions. Using the Langmuir isotherm model, the binding affinity constant, K was calculated, i.e., 6.881 × 103 M−1. Furthermore, the ability of the sensor to detect Cu2+ in spiked river water samples was also investigated, where Cu2+ as low as 0.5 until 100 ppm can be determined. This result shows that the sensor has high sensitivity and selectivity towards Cu2+ detection.

Graphical Abstract

Keywords

Surface plasmon resonance; Nanocrystalline cellulose; Graphene oxide; Ionophore; Metal Ions; Sensing

For more information, go to: https://doi.org/10.1016/j.sna.2023.114847.

(https://www.sciencedirect.com/science/article/pii/S0924424723006969)

Date of Input: 29/02/2024 | Updated: 01/03/2024 | roslina_ar