| Title: | Gold Nanoparticles-Functionalized Cotton as Promising Flexible and Green Substrate for Impedometric VOC Detection |
| Author(s): | Casalinuovo S; Caschera D; Quaranta S; Genova V; Buzzin A; Federici F; de Cesare G; Puglisi D; Caputo D; |
| Address: | "Department of Information Engineering, Electronics and Telecommunications, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy. Institute for the Study of Nanostructured Materials CNR-ISMN, Strada Provinciale 35d/9 00010, Montelibretti, 00010 Rome, Italy. Department of Chemical Engineering, Materials and Environment, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy. Division of Sensor and Actuator Systems, Department of Physics, Chemistry and Biology (IFM), Linkoping University, Campus Valla, 58183 Linkoping, Sweden" |
| ISSN/ISBN: | 1996-1944 (Print) 1996-1944 (Electronic) 1996-1944 (Linking) |
| Abstract: | "This work focuses on the possible application of gold nanoparticles on flexible cotton fabric as acetone- and ethanol-sensitive substrates by means of impedance measurements. Specifically, citrate- and polyvinylpyrrolidone (PVP)-functionalized gold nanoparticles (Au NPs) were synthesized using green and well-established procedures and deposited on cotton fabric. A complete structural and morphological characterization was conducted using UV-VIS and Fourier transform infrared (FT-IR) spectroscopy, atomic force microscopy (AFM), and scanning electron microscopy (SEM). A detailed dielectric characterization of the blank substrate revealed interfacial polarization effects related to both Au NPs and their specific surface functionalization. For instance, by entirely coating the cotton fabric (i.e., by creating a more insulating matrix), PVP was found to increase the sample resistance, i.e., to decrease the electrical interconnection of Au NPs with respect to citrate functionalized sample. However, it was observed that citrate functionalization provided a uniform distribution of Au NPs, which reduced their spacing and, therefore, facilitated electron transport. Regarding the detection of volatile organic compounds (VOCs), electrochemical impedance spectroscopy (EIS) measurements showed that hydrogen bonding and the resulting proton migration impedance are instrumental in distinguishing ethanol and acetone. Such findings can pave the way for the development of VOC sensors integrated into personal protective equipment and wearable telemedicine devices. This approach may be crucial for early disease diagnosis based on nanomaterials to attain low-cost/low-end and easy-to-use detectors of breath volatiles as disease markers" |
| Keywords: | Pvp citrate cotton gold nanoparticle (AuNP) impedance measurements volatile organic compound (VOC); |
| Notes: | "PubMed-not-MEDLINECasalinuovo, Silvia Caschera, Daniela Quaranta, Simone Genova, Virgilio Buzzin, Alessio Federici, Fulvio de Cesare, Giampiero Puglisi, Donatella Caputo, Domenico eng RG12117A84C979D3/Sapienza University of Rome/ Switzerland 2023/09/09 Materials (Basel). 2023 Aug 25; 16(17):5826. doi: 10.3390/ma16175826" |
