All hybrid films show an absorbance maximum at ∼260 nm corresponding to the band gap of the incorporated TNCs, as well as GO characteristic absorbances related to π -π * (at 235 nm) and n -π * (at 300 nm) electronic transitions (Supporting Information, Section S1and S2). Additionally, the TNP-based films show a shoulder at ∼305 nm. Previously, this feature was reported for organically cross-linked TNP composites and nanocrystalline TiO 2 thin films deposited via chemical vapor deposition, and attributed to the quantization of the band structure of the TNCs. The similar increase in absorbance obtained for each SC cycle using different TNCs suggests a comparable layer formation. Film thicknesses after one SC cycle were determined via AFM analysis (Supporting Information, Section S3) and were ∼17 nm and ∼18 nm for the GO/TNP-and GO/TNR hybrid films, respectively. Based on the absorbance measurements, the relative volume fractions of TNPs and TNRs within the films were estimated as 39% and 44%, respectively. The method used to calculate these volume fractions is described in the Supporting Information, Section S3.