Reversible Strategy of Water Monitoring Aimed at Amphiphilic Pollutants

Abstract

For monitoring diverse pollutants in a complicated water environment, the design and development of various detection strategies are necessary. Here, we introduce a general strategy of water monitoring aimed at amphiphilic pollutants using carbon nanotube based film. The pollutants with amphiphilic characteristics can tune the wetting behavior between carbon nanotubes and water molecules, leading to the change in the interface resistance of the carbon nanotube based film. The experimental results demonstrate that the change ratio of the film resistance is related to the concentration of pollutants in solution. This monitoring strategy is general for the detection of amphiphilic materials in mixed solution, such as surfactants and some organic solvent. The ability to achieve a sensitive and repeatable change in film resistance has potential applications in high-sensitivity, real-time, long-lasting, and multiple water monitoring.

Mechano‐Chromic Photonic Crystals with Substrate‐Independent Brilliant Colors for Visual Sensing and Anti‐Counterfeiting Applications

“…The possible way is to introduce light absorption materials into PCs to synchronously absorb the scattering of light from MPCs and substrates. Recently, dark‐colored colloids (polydopamine [PDA], [ 49,50 ] Cu 2 O, [ 51 ] Fe 3 O 4 , [ 52 ] and polysulfide [ 53 ] colloids) have been synthesized and then assembled into ordered or amorphous PCs with brilliant reflective colors because of their superior capability of absorption of light. Unfortunately, most of these colloids cannot be used directly to fabricate MPCs due to their inherent drawbacks including their large densities, low surface charges, and large variation of sizes.…”