Development of QCM Trimethylamine Sensor Based on Water Soluble Polyaniline

Abstract

A rapid, sensitive, low-cost device to detect trimethylamine was presented in this paper. The preparation of water soluble polyaniline was firstly studied. Then the polyaniline was characterized via Fourier transform infrared spectroscopy (FTIR), UV-visible spectroscopy and scanning electron microscopy (SEM). Based on the water soluble polyaniline film, a quartz crystal microbalance (QCM) sensor for trimethylamine detection was fabricated and its characteristics were examined. The sensor consisted of one quartz crystal oscillator coated with the polyaniline film for sensing and the other one for reference. Pretreated with trimethylamine, the QCM sensor had an excellent linear sensitivity to trimethylamine. Easily recovered by N2 purgation, the response of the sensor exhibited a good repeatability. Responses of the sensor to trimethylamine, ethanol and ethyl acetate were compared, and the results showed that the response was related to the polarity of the analyte vapor. Experimental result also showed that the sensitivity of the sensor was relatively stable within one month. The simple and feasible method to prepare and coat the polyaniline sensing film makes it promising for mass production.

A Dibutyl Phthalate Sensor Based on a Nanofiber Polyaniline Coated Quartz Crystal Monitor

“…For each vapor sample, 10 mL pure DBP or other gases were left on the bottom of a 1,000 mL glass container for 3 h, so that saturated volatile organic compounds could be extracted in the headspace of the container as the analyte. Appropriate analyte concentrations were obtained in the test chamber by injecting known volumes of headspace gas via a gas tight syringe [16]. Moreover, a small plastic air bag was used to keep the pressure balance.…”

“…A QCM sensor can be constructed by coating the quartz crystal electrodes surface with a film capable of interaction with the analyte of interest [16,17]. The operating principle of QCM sensors is based on the interaction between the surface of a quartz crystal coated with the sensing materials and the target materials.…”

Study of a QCM Dimethyl Methylphosphonate Sensor Based on a ZnO-Modified Nanowire-Structured Manganese Dioxide Film

“…The experiments were performed as follows: first, a target analyte was injected into the testing chamber, the sensing film then absorbed the analyte, thus decreasing the output frequency of the sensing QCM. The response of the QCM gas sensor, or an increase of the frequency difference between the sensing and reference QCMs to the analyte, was measured continuously at a 1-second interval [ 42 , 43 ]. After the response reached a plateau phase, the measurement course in a cycle was finished.…”

Detection of some volatile organic compounds with chitosan-coated quartz crystal microbalance

“…The adsorption mechanism could be based on the hydrogen-bonding and dipolar interactions [30] between the amines vapor with hydroxyl and protonated amines sites of Cs chains.…”