TY  - JOUR
AU  - Bittinger, Sophia C.
AU  - Struck, Jana
AU  - Dobschall, Finn
AU  - Benthien, Sophie
AU  - Hartmann, Hauke
AU  - Schlicke, Hendrik
AU  - Kohantorabi, Mona
AU  - Noei, Heshmat
AU  - Vossmeyer, Tobias
TI  - Nanocomposites of Titania/Reduced Graphene Oxide: Flexible Humidity Sensors Tuned via Photocatalytic Reduction
JO  - ACS applied nano materials
VL  - 8
IS  - 15
SN  - 2574-0970
CY  - Washington, DC
PB  - ACS Publications
M1  - PUBDB-2025-01850
SP  - 7428 - 7439
PY  - 2025
AB  - In this study, we demonstrate the tunability of hybrid graphene oxide/reduced graphene oxide/titania nanocrystal (GO/rGO/TNC) films for resistive humidity sensing through photocatalytic reduction. Using a layer-by-layer spin-coating (LbL-SC) technique, we fabricate GO/TNC nanofilms with titania nanorods (TNRs) or nanoplates (TNPs) on various substrates, achieving high uniformity and precise control over the film thickness (15–150 nm). We investigate the evolution of the electrical, optical, and structural properties of these films, modulated by the photocatalytic activity of TNCs under UV exposure (254 nm) while varying the illumination time, TNC type, and film thickness. The inclusion of TNCs enhances the films’ conductivity by several orders of magnitude compared to pure GO films under UV illumination and enables precise adjustment of the GO/rGO and (GO/rGO)/TNC ratios. This approach is used for tuning the sensitivity, response time, and response polarity of (GO/rGO)/TNC resistors on flexible substrates to changes in relative humidity (RH). TNP-based films demonstrate superior performance, achieving sensitivities of up to 2.2 and response times as short as 1 s over a broad range of RH levels (∼35 to 85
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001461018600001
DO  - DOI:10.1021/acsanm.4c06524
UR  - https://bib-pubdb1.desy.de/record/630145
ER  -