Drop-coated sensing layers on ultra low power hotplates for an RFID flexible tag microlab

Graphene quantum resistive sensing skin for the detection of alteration biomarkers

“…This increasing interest of smart packaging may also result from the finding that one-third of all food production is wasted. Existing technologies are based on colorimetric [22][23][24] or chemo-resistive [25][26][27][28][29][30][31][32][33][34][35][36][37][38] sensors that can detect chemicals released during food spoilage or maturation. 14 In this context intelligent packaging can bring solutions to reduce food loss.…”

A New Strategy for Detecting Plant Hormone Ethylene Using Oxide Semiconductor Chemiresistors: Exceptional Gas Selectivity and Response Tailored by Nanoscale Cr2O3 Catalytic Overlayer

“…This explanation is plausible, considering that ethylene is a very stable gas; hence, its oxidation is relatively difficult. [ 3,27,30 ] In contrast, the decrease in the gas responses to TMA, DMA, NH 3 , ethanol, HCHO, and CO could be attributed to the oxidative consumption of these gases in the thick SnO 2 sensing film. However, as shown in Figure 4e, the responses to the seven different gases were not distinctively different from each other, and thus this method was considered to be insufficient for use in the selective detection of a specific gas.…”

“…However, the responses of metal oxide semiconductor gas sensors to ethylene are generally significantly lower than the responses to more reactive interfering gases, including food‐related gases (TMA, DMA, and NH 3 ), ubiquitous ethanol, and indoor air pollutants (HCHO and CO). [ 29–32,49,50 ] Accordingly, it is very challenging to detect ethylene in a highly selective and sensitive manner in the presence of the aforementioned interfering gases.…”

“…Studies on ethylene sensing using oxide semiconductor chemiresistors are currently in the nascent stage. Although catalyst loading/doping has been employed to enhance the response to ethylene, [ 29–31 ] this has frequently been accompanied by an increase in the responses to interfering gases and/or an increase in sensor resistance beyond the measurable range; consequently, this has hampered selective ethylene detection and/or resistance measurements, when using a conventional electric circuit. In addition, although sensor arrays consisting of multiple oxide‐based sensors [ 32 ] have been investigated, their ability to discriminate and quantify sub‐ppm‐levels of ethylene is still insufficient for utilization in practical applications and for assessing fruit freshness.…”

Wireless Hydrogen Smart Sensor Based on Pt/Graphene-Immobilized Radio-Frequency Identification Tag

“…Vapor/air was supplied at various flow rates of 2-8 slm and 1-5 sccm using the MFC. 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 ACS Paragon Plus Environment 1 2 3 4...…”