Flexible Ultraviolet and Ambient Light Sensor Based on a Nanomaterial Network Fabricated Using Selective and Localized Wet Chemical Reactions

Abstract

We report ZnO nanowire and TiO 2 nanotube based light sensors on flexible polymer substrates fabricated by localized hydrothermal synthesis and liquid phase deposition (LPD).This method realized simple and cost-effective in-situ synthesis and integration of onedimensional ZnO and TiO 2 nanomaterials. The fabricated sensor devices with ZnO nanowires and TiO 2 nanotubes show very high sensitivity and quick response to the ultraviolet (UV) and ambient light, respectively. In addition, our direct synthesis and integration method result in mechanical robustness under external loading such as static and cyclic bending because of the strong bonding between nanomaterial and electrode. By controlling the reaction time of LPD process, Ti:Zn ratio could be simply modulated, and the spectral sensitivity to the light in the UV to visible range could be controlled.

Nonspherical Metal‐Based Nanoarchitectures: Synthesis and Impact of Size, Shape, and Composition on Their Biological Activity

“…The hydrothermal method has been used to synthesize metal nanowires such as ZnO, [ 111 ] CoS, [ 112 ] MnO 2 , [ 36 ] Pd, [ 113 ] and Co 3 O 4. [ 114 ] The mechanism for synthesis of ZnO nanowires is similar to what was described earlier for nanorods in Section 2.1.3.…”

3D Printed Multifunctional Self‐Adhesive and Conductive Polyacrylamide/Chitosan/Sodium Carboxymethyl Cellulose/CNT Hydrogels as Flexible Sensors

“…[ 12 ] This type of sensor not only shows a more comfortable experience during wearing, but also can collect signals more accurately. [ 13,14 ] The hydrogel sensor is capable of converting external stimuli such as temperature, [ 15,16 ] humidity, [ 17 ] pressure, [ 18,19 ] and light [ 20 ] into electrical signals that can be recorded. Therefore, the electrical conductivity is of great significance for such flexible sensors.…”

“…[13,14] DOI: 10.1002/macp. 202200272 The hydrogel sensor is capable of converting external stimuli such as temperature, [15,16] humidity, [17] pressure, [18,19] and light [20] into electrical signals that can be recorded. Therefore, the electrical conductivity is of great significance for such flexible sensors.…”

All 3D-Printed Flexible ZnO UV Photodetector on an Ultraflat Substrate

“…Flexible and wearable UV photodetectors (PDs) have attracted considerable interest over the last decade due to their applications in medical and healthcare, space, military, and scientific instruments. − A variety of printing techniques including roll-to-roll gravure, aerosol jet printing, screen printing, inkjet printing, and three-dimensional (3D) printing − have been used to demonstrate printed and flexible electronics applications. These demonstrations cover sensors, energy-storage and -harvesting devices, photodetectors, and biomedical components among many others, and the range is expanding from rapid prototyping of a simple component to complicated on-demand functional devices. − However, all of these methods have required a mandatory substrate such as a wafer, glass, or polymer film as the starting material, which results in issues of inventory management and waste increase. , A popular 3D-printing method is the fused deposition modeling (FDM), , which provides direct writing of the nonconductive thermoplastic material. Complete 3D-printing methods have not yet been accomplished to date to produce functional devices, largely due to the high surface roughness of the 3D-printed layer.…”

“…13−18 However, all of these methods have required a mandatory substrate such as a wafer, glass, or polymer film as the starting material, which results in issues of inventory management and waste increase. 19,20 A popular 3D-printing method is the fused deposition modeling (FDM), 15,16 which provides direct writing of the nonconductive thermoplastic material. Complete 3D-printing methods have not yet been accomplished to date to produce functional devices, largely due to the high surface roughness of the 3D-printed layer.…”