Amperometric Sensor for Monitoring Ethylene

Abstract

Sensing electrodes were fabricated by chemical deposition of gold onto a Nafion membrane. These electrodes, with suitable choice of real surface area, applied potential, supporting electrolyte, and gas flow rate, showed a detection limit of 40 ppb ethylene for a signal-to-noise ratio of 3. A linear response was observed up to at least 500 ppm. The choice of flow rate was especially influential as it was found to affect the mechanism of the sensor response, which is kinetically controlled even at relatively low flow rates. No cross-sensitivity was found to ethanol and acetaldehyde which might be present in certain applications of the sensor, such as in horticulture.

Monitoring plants health in greenhouse for space missions

“…We notice that the correlation of the MOX with humidity is now strongly reduced (the column number 6, RH C gets darker). This is particularly the case for the MOX 2,4,5. Consequently, also the correlation between MOX 2, 4, 5 -which was due to their common humidity dependence-is also diminished (e.g. column 5 is darker).…”

“…The monitoring of ethylene is routinely performed using gas chromatography [6], but for space mission a small, low cost, low power consumption ethylene sensor is necessary. In literature, different type of sensors have been developed for monitoring low concentration of ethylene: electrochemical sensor [4,5], optical sensor (chemiluminescence method [8] and Fabry Perot interferometer [9]), metal oxide semiconductor field effect transistors with Pt-gate (Pt MOSFET) [6].…”

Ni(II)cyclam Catalyzed Reduction of CO2 – Towards a Voltammetric Sensor for the Gas Phase

“…Metal-SPE based gas sensors have been developed in our group for methane [35], ethylene [36], ethylene oxide [37], acetylene [38], formaldehyde [39], acetaldehyde/ethanol [31], SO 2 [40], NO and NO 2 [41]. This electrode architecture is based on a porous sensing electrode which is directly exposed to the gas phase and separated from the electrolyte solution by a non-porous ion-conducting membrane such as Nafion.…”

Synthesis Sensitive Layer of Ethylene Gas Sensor Based Tin Oxide Nanoparticles Using Water as Solvent In Precipitation Method

“…Hence, there is a need for simple, compact, inexpensive, portable, and reliable ethylene sensors that could be used parallel in controlling ethylene concentration systems. The technologies that have been commonly used include gas chromatography [3], optical sensors [4], colorimetric sensors [5], amperometric sensors [6], photoluminescence sensors [7], gravimetric sensors [8], and chemoresistive and capacitive sensors [9,10]. From technologies has been mentioned, chemoresistive can meet criteria desired One of material frequently used as sensitive layer in gas sensor is tin oxide (SnO2), because of its properties including fast-response speed, high chemical stability, and prominent selectivity.…”