Extended Data Fig. 1: Characterization of the photocurrent in AuTiO2-x NW arrays.
a, Schematic of AuTiO2-x NW arrays photocurrent measurement with UV (375/28 nm, 292.99 μW·mm−2), blue (470/20 nm, 318.47 μW·mm−2) or green (546/12 nm, 420.38 μW·mm−2). The photocurrents were measured by Ag/AgCl electrodes attached to the surface of the NW arrays in normal saline solution. b, Photocurrents generated by illumination of UV, blue, green and red light, receptively with an AuTiO2-x NW arrays. c, UV-visible absorbance spectra of original TiO2 and AuTiO2-x. d, Compared with the published results30, the photocurrent of improved NW arrays increased by 760.08%, 559.48% and 556.80% under UV, blue and green light, receptively. e,f, Example of photocurrent measures obtained with UV light stimulus (DMD, wavelength: 400 nm) at 10 μW·mm−2 (e) and 3 μW·mm−2 (f) for 0.005–1.0 sec pulse duration. g, Photocurrent at 10 μW·mm−2 (top) and 3 μW·mm−2 (bottom) for 1.0, 0.5, 0.2, 0.1, 0.05, 0.025 and 0.005 sec in e and f. h, Representative photocurrent recording with UV stimulus (DMD, wavelength: 400 nm, light intensity: 10 μW·mm−2) at different flicker frequency (Magenta, 1.0 Hz; blue, 2.5 Hz; cyan, 5.0 Hz; green, 10.0 Hz; red, 20 Hz). i, Zoom in photocurrent of gray rectangle in h. Dashed black line indicate the stimuli on. j, Mean latency of NW arrays to light stimulus (n = 31 measurements from 4 NW arrays). Latency was defined as the time difference between the onset of the visual stimuli and the time that photocurrent reaches the peak value. All data are expressed as mean ± SEM.
