| Integrating polymer with biological matters to form hybrids or conjugates is innovative in organic/organic system with significantly promise for sensor,medical,and materials science.Because of its high conductivity,good environmental stability,easy synthesis,high thermal stability and non-toxicity,polypyrrole has potential application prospects in many fields.However,the polypyrrole film is difficult to be applied to the flexible electronic sensor due to its lack of adhesion and great brittleness.Meanwhile,the unstable adhesion of polypyrrole precipitation prevents it from being better used.In order to solve this problem,this paper proposed to compound protein aggregates with amyloid-like assembly structure with polypyrrole,and to hybridize protein film formed by lysozyme amyloid-like transformation and phase transition precipitation with polypyrrole to form functional composites.This research includes the following two parts:(1)The assembly and integration route of the conductive polypyrrole two-dimensional nanofilm on lysozyme nanofilm was establishedIn this study,a uniform two-dimensional nanocomposite film with the hybridization of lysozyme and polypyrrole was prepared at the gas-liquid interface.Lysozyme was employed as the biological adhesion template,and the polypyrrole conductive layer assembled onto lysozyme film,forming a hybrid and functional film with both conductivity and bio-adhesion.The functionality and potential application of the composite film were investigated by detecting its conductivity,patterning and antibacterial properties.The composite film can form 100 μm,50μm and 5μm micropatterns in strip,round and square shape under the irradiation of ultraviolet light,and can inhibit the growth of Escherichia coli to have certain antibacterial property.Due to its remarkable electrical conductivity,the flexible electronic sensor based on the composite film can effectively detect the tiny movement changes by converting the movement signals into visible electrical signals,such as finger bending,pulse beating and other human physiological activities.This method not only provides a new way for the preparation of functionally flexible nanofilms in organic/organic system,but also has potential applications in intelligent packaging and the printed electronic device in the future.(2)A method of the preparing functional composite coating by combined assembly of polypyrrole and lysozyme was proposedIn this work,a facile co-precipitation method was developed to prepare conductive composite via a co-assembly process with one-step.Lysozyme phase transition precipitation was used as a template to compound with polypyrrole at the solid-liquid interface to form a functional composite coating.The structure and morphology of the hybrid product was characterized by X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FT-IR),transmission electron microscopy(TEM),scanning electron microscopy(SEM)and laser scanning confocal microscopy(LSCM),and so on.The results show that the composite coating is composed of nanoparticles with uniform particle size and has better conductivity than pure polypyrrole precipitation.The results of 3M tape stripping experiment showed that the weight loss rates of gauze coated with pure polypyrrole precipitation and gauze coated with composite deposition coating were 17.53%and 3.80%,respectively,indicating that the composite deposition coating had better bio-adhesion.In addition,the composite material is directly coated on the surface of pure white gauze substrate for infrared thermal imaging test,and the results show that it has good infrared shielding property.Because of its excellent conductivity and infrared shielding property,the composite deposition coating is expected to be used as conductive printing filler and infrared shielding material in the future,which has a wide range of development prospects and application potential. |
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