Jan-Kees Boerman, Leiden University

Fruit ripening measurement with GFET

Large part of the food crops are lost due to ethene-induced spoilage during transport. In order to respond to varying ethene concentrations, to prevent spoilage or induce ripening, detection of ethene at the low range of biologically relevant concentrations (<100 ppb) is required, which poses a technological challenge. We have recently developed a new sensor platform based on graphene in combination with copper(I) coordination compounds. These graphene field-effect transistors (GFETs) were used in gas-detection experiments with ethene and ethanol (for comparison) and were found to be extremely effective with detection limits well below 100 ppb. The reversible binding of ethene to the copper compound results in an electrical signal via the graphene substrate, which gives the response that can be monitored.

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