PVP is used to improve the performance of photoresist

Two-color photosensitive laser Direct writing (TCS-DLW) is a novel nanolithography technique, which can break the optical diffraction limit and directly realize the fabrication of arbitrary 2D/3D micro-nano structures with sub-hundred nanometer resolution. Organic polymer photoresist is a medium and carrier for micro and nano fabrication by two-color photosensitive laser direct writing technology, which directly affects the precision and authenticity of the micro and nano structures. Recently, Chinese scientists developed a polyvinylpyrrolidone (PVP) hybrid two-color photoresist. PVP has good compatibility with the active monomer of photoresist, which can improve the mechanical strength of photoresist, increase the conversion rate of polymerization monomer and reduce the polymerization threshold. The introduction of PVP also reduces the volume shrinkage of the photoresist from 18% to 3%, greatly reduces the internal stress of the fabricated micro and nano structures, and improves the accuracy of the lithography and the authenticity of the micro and nano structures. Compared with the non-hybrid PVP photoresist, the optimal photolithographic accuracy of PVP hybrid photoresist is improved from 85nm to 48nm, and the machining lines show higher uniformity and stability, and can manufacture any 2D/3D micro-nano structures with high quality and precision, which is expected to be widely used in optics, biology, microfluidic devices and other fields.

PVP is a fine chemical downstream of acetylene, it is a polymer material with excellent performance, with excellent biocompatibility, solubility (both soluble in water, but also soluble in many organic solvents), complex, dispersibility, film formation, solubilization, bonding, chemical stability, bioinert and safe and non-toxic. Widely used in cosmetics, medicine and health, food, textile printing and dyeing, paper making, adhesives, coatings, pigments, detergents, metal processing, energy, polymer polymerization, electronics, separation film, lithium battery, photovoltaic, medical polymer materials, nanomaterials, graphene, catalysts, adsorption materials and agriculture and animal husbandry and other fields. At present, the new uses of PVP are still emerging and in the ascendant.