Molecularly Imprinted Polyvinyl Acetate Doped with Boric Acid for Sensitivity and Selectivity of Ammonia Sensing by QCM
Penulis/Author
NUR AISYAH HUMAIRAH (1); IHSAN NURIJAL (2); Prof. Drs. Roto, M.Eng, Ph.D. (5); Dr.Eng. Ahmad Kusumaatmaja, S.Si., M.Sc. (6); Prof. Dr. Eng. Kuwat Triyana, M.Si. (8)
Tanggal/Date
2 2022
Kata Kunci/Keyword
Abstrak/Abstract
The detection of ammonia gas is essential for many applications; however, the sensitivity and selectivity of sensors for detecting ammonia are still poor. In this study, we develop an ammonia sensor based on quartz crystal microbalance (QCM) using a simple preparation of molecularly imprinting polymer (MIP) and doping addition to improve sensitivity to and selectivity of ammonia. The ammonia imprinting polyvinyl acetate (PVAc) nanofiber with boric acid (BA) is prepared using the electrospinning method on the QCM surface. The active layer materials are then characterized by a scanning electron microscope equipped with dispersive x-ray and Fourier transform infrared spectroscopy to examine the morphology and the functional groups. The sensitivity of the ammonia sensor developed using the MIP-doped BA method resulted in 0.243 Hz/ppm, which is three times greater than the sensor developed without the MIP method. Apart from the significantly enhanced sensitivity, high selectivity to ammonia was also observed. The response dramatically increased when the QCM-PVAc MIP 6BA sensor was exposed simultaneously with ammonia, trimethylamine, and methylamine. In contrast, a significantly decreased response was observed when the QCM-PVAc MIP 6BA sensor was exposed simultaneously without ammonia. This suggests that the ammonia imprinting PVAc-doped BA is a promising new method for obtaining high sensitivity and selectivity sensors.
