| Title: | Form Birefringence in Resonant Transducers for the Selective Monitoring of VOCs under Ambient Conditions |
| Author(s): | Oliva-Ramirez M; Lopez-Santos C; Berthon H; Goven M; Portoles J; Gil-Rostra J; Gonzalez-Elipe AR; Yubero F; |
| Address: | "Instituto de Ciencia de Materiales de Sevilla (CSIC, University of Seville), CICCartuja, Avda. Americo Vespucio 49, E-41092 Seville, Spain. NEXUS Nanolab, Newcastle University, G8 XPS laboratory Stephenson Building, Newcastle upon Tyne NE1 7RU, United Kingdom" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "In this work, we have developed a new kind of nanocolumnar birefringent Bragg microcavity (BBM) that, tailored by oblique angle deposition, behaves as a selective transducer of volatile organic compounds (VOCs). Unlike the atomic lattice origin of birefringence in anisotropic single crystals, in the BBM, it stems from an anisotropic self-organization at the nanoscale of the voids and structural elements of the layers. The optical adsorption isotherms recorded upon exposure of these nanostructured systems to water vapor and VOCs have revealed a rich yet unexplored phenomenology linked to their optical activity that provides both capacity for vapor identification and partial pressure determination. This photonic response has been reproduced with a theoretical model accounting for the evolution of the form birefringence of the individual layers upon vapor condensation in nanopores and internanocolumnar voids. BBMs that repel water vapor but are accessible to VOCs have been also developed through grafting of their internal surfaces with perfluorooctyltriethoxysilane molecules. These nanostructured photonic systems are proposed for the development of transducers that, operating under environmental conditions, may respond specifically to VOCs without any influence by the degree of humidity of the medium" |
| Keywords: | Oad form birefringence grafting functionalization nanoporous Bragg microcavity nanostructural anisotropy optical VOC monitoring optical adsorption isotherms; |
| Notes: | "PubMed-not-MEDLINEOliva-Ramirez, Manuel Lopez-Santos, Carmen Berthon, Hermine Goven, Mathilde Portoles, Jose Gil-Rostra, Jorge Gonzalez-Elipe, Agustin R Yubero, Francisco eng 2021/04/16 ACS Appl Mater Interfaces. 2021 Apr 28; 13(16):19148-19158. doi: 10.1021/acsami.1c02499. Epub 2021 Apr 15" |
