SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 3: Poster Session I

HL 3.1: Poster

Monday, September 27, 2021, 10:00–13:00, P

Biopolymer-templated TiO2 SERS sensors — •qing chen^1,2, marie betker^1,4,5, constantin harder^1,3, calvin brett^1,5, matthias schwartzkopf¹, nils ulrich⁷, maria eugenia toimil molares⁷, christina trautmann⁷, daniel söderberg^4,5, christian weindl³, volker körstgens³, peter müller-buschbaum^3,6, mingming ma², and roth stephan¹ — ¹DESY, Notkestraße 85, 22607 Hamburg, Germany — ²USTC, 230026 Hefei, China — ³TUM, James-Franck Straße 1, 85748 Garching, Germany — ⁴KTH, Teknikringen 56-58, 100 44 Stockholm, Sweden — ⁵WWSC, Teknikringen 52-56, 100 44 Stockholm, Sweden — ⁶MLZ, TUM, Lichtenbergstraße 1, Garching 85748, Germany — ⁷GSI Helmholtz Center, Planckstrße 1, Darmstadt 64291, Germany

Titanium dioxide (TiO2) is an excellent candidate for semiconductor metal oxide-based Surface enhanced Raman scattering (SERS) substrate. We report a novel strategy of the cellulose nanofibril (CNF) - assisted assembly of TiO2/CNF thin-films with a hierarchical three-dimensional network and crystallinity as a SERS substrate. TiO2/CNF thin-films are obtained through the combined action of surface templating and thermal annealing. A high enhancement factor in terms of semiconductor SERS substrates for 4-mercaptobenzoic acid of 1.79 * 106 is obtained in the TiO2/CNF thin-films on ITO substrate with a thickness of 10 nm after thermal annealing. Our approach realizes the improvement of SERS sensitivity of semiconductor metal oxide nanomaterials through a cooperative modulation of the biotemplate morphology and the TiO2 crystalline state.