One-step synthesis of Poly(amic acid)/ZnO composite particles and its SERS applications

Optical biosensors based on ZnO nanostructures: advantages and perspectives. A review

“…Due to their high surface/volume ratio, surface tailoring ability, novel electron transport properties and electronic conductance multifunctionality it is possible to successfully immobilize various types of biomolecules. Mostly nanorods (NRs) [36,38,40,43,45,47,48,53,56,74,82,86] and nanowires (NWs) [29,33,42,46,49,75,77,94] were used as a biosensor platform. Nanoparticles (NPs) [35,37,50,83,84,97,98], quantum dots [34,44], other low-dimentional structures [30,32,39,52,70,71,76,79,80,81,85,89,93,95,99] and thin films [31,51,72,73] ...…”

“…Poly(amic acid) (PAA) is used to improve the immobilization process. Wu et al have used the PAA particles in the range of 133 -213 nm, coated with small ZnO nanoparticles (3 -13 nm) to obtain high coverage of the ZnO nanoparticles over the Poly(amic acid) microsphere of the raspberry-like particle [36]. Various self-assembly and nanolithography techniques have been employed to fabricate 3D surface enhanced Raman spectroscopy (SERS) substrates, which involves a compromise among sensitivity, scalable area, reproducibility and cost [48].…”

PAA/ZnO Raspberry-Shaped Composite Microspheres Decorated with Ag Nanoparticles as Cleanable SERS Substrates

“…In addition, the Fermi level of Ag nanoparticles is higher than that of ZnO nanoparticles, and the Fermi level of ZnO nanoparticles is higher than than that of PAA microspheres. Electrons of Ag nanoparticles are easily transferred to the conduction band of ZnO nanoparticles at the PAA/ZnO interface . In this case, the accumulation of electrons at the interface causes a potential barrier and causes different charge distributions on both sides of the Ag nanoparticles.…”

“…Moreover, organic–inorganic composite particles are prepared by first functionalizing the surface of the core particles and then combining them . Recently, in our research group, PAA/ZnO composite particles were prepared on the basis of the hybrid coagulation method . Compared with surface modification methods, , this method can be used for facile synthesis of composite particles without any surface modification.…”

Synergetic Effect in Raman Scattering of ZnO Nanoparticles in ZnO–CNT Fibers: A Way To Enhance the G and 2D Band

“…Therefore, metal oxide semiconductors may be good candidates for SERS substrates. On the other hand, there are few reports of ZnO semiconducting nanoparticles as SERS substrates. − Most work on ZnO related to SERS substrates was done by combining with metal nanoparticles (Ag or Au), such as ZnO–Ag or ZnO–Au. , Other studies − of SERS have focused on organic or dye molecules. Thus, far, there are no studies of the synergetic effects in Raman scattering of ZnO nanoparticles in SERS fibers and its relationship with enhanced G and 2D bands through the vibrational force of Zn–O system in deformed structure.…”