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This article discusses a colorimetric sensor array that uses metal-organic framework films to detect and classify perfume scents. The sensor system is able to detect chiral odor molecules and discriminate between different commercial perfume scents. The sensor read-out is captured using a smartphone camera and analyzed using a machine-learning algorithm. The research article provides more detailed information on the topic. [Extracted from the article]

Vanadium oxide (VOx) is a promising candidate as a material for smart windows, and 0.7 wt% Nb-doped SrTiO3 (NSTO) is frequently used in electrodes for electro-optic devices. Here, we demonstrate that a rectifying VOx/Nb: SrTiO3 heterojunction has a photovoltaic response. It can be used in thermochromic photovoltaic modulating devices. The crystalline structure and electrical characteristics of VOx thin film deposited on NSTO were investigated. It was found that an asymmetric hysteresis current between increasing and decreasing voltages occurs at 80, 300 and 360 K. The photovoltaic effect was observed under irradiation by a pulsed laser. [ABSTRACT FROM AUTHOR]

Many odors, like perfumes, are complex mixtures of chiral and achiral molecules where the cost-efficient (enantio-)selective sensing represents a major technical challenge. Here, we present a colorimetric sensor array of surface-mounted metal-organic-framework (SURMOF) films in Fabry-Pérot (FP) cavities. The optical properties of the FP-SURMOF films with different chiral and achiral structures are affected by the (enantio-)selective adsorption of the analytes in the SURMOF pores, resulting in different responses to the analyte molecules. The read-out of the sensor array is performed by the digital camera of a common smartphone, where the RGB values are determined. By analyzing the sensor array data with simple machine learning algorithms, the analytes are discriminated. After demonstrating the enantioselective response for a pair of pure chiral odor molecules, we apply the sensor array to detect and discriminate a large number (16) of common commercial perfumes and eau de toilettes. While our untrained human nose is not able to discriminate all perfumes, the presented colorimetric sensor array can classify all perfumes with great classification accuracy. Moreover, the sensor array was used to identify unlabeled samples correctly. We foresee such an FP-chiral-SURMOF-based sensor array as a powerful approach toward inexpensive selective odors sensing applications., (© 2024 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)

An optical sensor array based on photonic Fabry-Pérot films of surface-mounted metal-organic-frameworks (SURMOFs) with different homochiral structures is presented. It is used to detect and enantioselectively discriminant 3 pairs of chiral odor molecules, either pure or in binary mixtures.