▎ 摘　　要

DNA complexes formed with graphene oxide (GO) and riboflavin (RF) have multiple interesting characteristics and unique features owing to specific properties of the DNA. Herein, we develop a fabrication method for GO- and RF-embedded DNA and cetyltrimethyl ammonium chloride-modified DNA (DNA-CTMA) thin films with varying concentrations of GO ([GO]) and fixed [RF] content that uses a simple drop-casting process. The properties of the fabricated thin films were investigated to understand (a) the chemical interactions between GO, RF and DNA (DNA-CTMA) molecules using Fourier transform infrared (FTIR) and Raman, (b) the variation in chemical features and spin states using x-ray photoelectron spectroscopy (XPS), (c) the characteristic wavelengths using UV-Vis absorption, (d) electron transfer between energy states using photoluminescence (PL), and (e) electrical conduction using current measurements. The FTIR, Raman, XPS, and UV-Vis spectra of the GO- and RF-embedded DNA and DNA-CTMA thin films exhibit noticeable changes in peak intensity and experience peak shifts with varying [GO] content. The PL spectra of the thin films show a quenching phenomenon with increasing [GO] content due to decreases in recombination efficiency. The increases in current observed with the addition of GO to the DNA and DNA-CTMA thin films can be attributed to the conducting nature of GO. The optical and electrical properties of the GO- and RF-embedded DNA and DNA-CTMA thin films can easily be tuned by the adjusting the [GO] content. Consequently, our thin films show great promise for application in various types of bio-sensors and bio-photonic devices.