Flexible PDMS-Based SERS Substrates Replicated from Beetle Wings for Water Pollutant Detection.

The flexible surface-enhanced Raman scattering (SERS) sensor, which has the bionic 3D nanoarray structure of a beetle-wing substrate (BWS), was successfully prepared by replicated technology and thermal evaporation. The bionic structure was replicated with polydimethylsiloxane (PDMS) and then silver (Ag) nanoisland thin films were deposited by thermal evaporation. The deposition times and thicknesses (25-40 nm) of the Ag thin films were manipulated to find the optimal SERS detection capability.

Replica of Bionic Nepenthes Peristome-like and Anti-Fouling Structures for Self-Driving Water and Raman-Enhancing Detection.

The flexible, anti-fouling, and bionic surface-enhanced Raman scattering (SERS) biochip, which has a Nepenthes peristome-like structure, was fabricated by photolithography, replicated technology, and thermal evaporation. The pattern of the bionic Nepenthes peristome-like structure was fabricated by two layers of photolithography with SU-8 photoresist. The bionic structure was then replicated by polydimethylsiloxane (PDMS) and grafting the zwitterion polymers (2-methacryloyloxyethyl phosphorylcholine, MPC) by atmospheric plasma polymerization (PDMS-PMPC).

Co-Doped BiOBrCl hierarchical microspheres display enhanced visible-light photocatalytic performance in the degradation of rhodamine B and antibiotics and the inactivation of E. coli.

In this article, we have synthesized Co-doped BiOBrCl hierarchical nanostructured microspheres, featuring different degrees of Co doping, displaying excellent photocatalytic performance. X-ray diffraction and Raman spectroscopy indicated that the Co ions were successfully doped into the BiOBrCl nanocrystals. The photodegradation rate of rhodamine B mediated by a doped BiOBrCl was 150 % greater than that of the non-doped BiOBr.