THE ARTIFICIAL NOSE-BASED PMMA-rGO COMPOSITE COATED QCM SENSOR TO SNIFF COFFEE AROMA AT DIFFERENT ROASTING DEGREE

Authors

DOI:

https://doi.org/10.15575/ak.v11i2.40381

Keywords:

PMMA, rGO, QCM sensor, Coffee aroma, Surface roughness

Abstract

The quality of a product, including coffee, can be determined by its aroma, which is influenced by various chemical compounds. Human olfactory-based assesment and other technologies have been developed to assess coffee aroma; however, these methods are often costly and require highly trained professionals. Gravimetric-based sensors, such as quartz crystal microbalance (QCM) sensors, offer high sensitivity, ease of use, and the capacity to modify their effective surface with nanomaterials. In this research, an artificial nose-based QCM sensor has been modified using a material-sensitive polymethyl methacrylate-reduced graphene oxide (PMMA-rGO) composite.The composite materials were synthesised using an in-situ polymerisation method in the presence of dual solvent. IR characterisation revealed PMMA and PMMA-rGO spectra to be highly similar, suggesting successful trapping of rGO within the PMMA matrix via physical interaction. Increasing the content of rGO resulted in a slight increase in the surface roughness of the QCM sensor.The composite-based QCM sensor demonstrated the capacity to detect coffee aroma at three distinct roasting temperatures (220℃, 225℃, and 230 ℃). The highest response was observed in sample PR1, with a value of -35.2 Hz (220℃), -44.3 Hz (225℃), and -83 Hz (230℃) for the variation in the amount of rGO in the polymer matrix. The presence of rGO with their surface area properties enhanced the QCM sensor to detect coffee aroma.

Author Biographies

Ferry Chrismiadi Nalle, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Brawijaya University, Malang 65142, Indonesia

I am currently a master student in the Department of Chemistry.

Akhmad Sabarudin, Department of Physics, Faculty of Mathematics and Natural Sciences, Brawijaya University, Malang 65142, Indonesia

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Setyawan Purnomo Sakti, Department of Physics, Faculty of Mathematics and Natural Sciences, Brawijaya University, Malang 65142, Indonesia

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Published

2024-12-30

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Vol. 11 No. 2 (2024): al Kimiya: Jurnal Ilmu Kimia dan Terapan

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