On the Rational Design of Mesoporous Silica Humidity Sensors

Máté Füredi, Alberto Alvarez-Fernandez, Maximiliano Jara Fornerod, Bálint Fodor, Stefan Guldin

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Mesoporous silica is commonly used as matrix for humidity sensors which operate on the principle of relative humidity (RH)-dependent water uptake and read-out by resistance (R) monitoring. Although numerous studies have been dedicated to improving sensitivity with conductive additives, the role of the pore architecture on the sensing behavior has not been systematically investigated so far. Herein, the effects of pore size and porosity on resistive sensing performance in the 0.5–85% RH range are showcased. Across various sensors, a clear correlation is identified between mesopore size and linear RH sensing range. Sensors with larger pores (≈15 nm) exhibit linear response in the 65 to 85% RH range with larger slope (ΔlogR/ΔRH) than sensors with smaller pores (
Original languageEnglish
Article number2200077
Number of pages11
JournalAdvanced Sensor Research
Volume2
Issue number7
DOIs
Publication statusPublished - Jul 2023

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