The Application Of Plasmonic Noble Metal Nanoparticles:Imaging,detection And Catalysis

Localized surface plasmon resonance(LSPR)is rising by the coupling of incident electromagnetic waves with the collective oscillation of free electrons in the metal.The coupling interaction brings noble metal nanomaterials with excellent optical properties,such as bright and stable scattering without photo-blinking and photo-bleach.Moreover,plasmonics related to the location,guiding and manipulation of electromagnetic waves beyond the diffraction limit and down to the nanometer-length scale.In addition,the unique plasmonic properties are highly sensitive to the composition,size,shape,coupling as well as local dielectric environment.In consequence,plasmonic nanomaterials have been widely used in chemical and biological sensing,imaging,tracking,phtothermal therapy and photo-catalysis.Here,we focused on the LSPR and catalytic properties of noble metal nanoparticles,and illustrated its application in imaging,sensing,tracking and catalysis or enhanced catalysis.Three works have been accomplished as following:Firstly,we developed a dual-functional probe for latent fingerprints(LFPs)imaging and explosive(RDX)detection by recruiting the novel scattering properties of gold nanoparticles(Au NPs).The high spatial dark field image of latent fingerprint was achieved as well as the detail characteristics of level 2 and level 3 of sebaceous LFPs could be clearly resolved.Simultaneously,based on the competitive reaction of RDX and Cu2+ when reducing by NADH and the formation of Au@Cu core/shell structures,the quantitative detecting of RDX residues in LFPs was achieved by DFM.The combination of fingerprint imaging and explosive detecting could be used to track the terrorists in forensic investigation.Secondly,we reported a catalysis-driven self-propulsion Janus plasmonic nanomotor by combing the LSPR and catalytic properties of Au NPs.The motion of Janus nanomotor was tracked by Resonance Light Scattering Correlation Spectroscopy(RLSCS)through the strong scattering of plasmonic nanoparticles.Recovered the underlying driven mechanism is self-thermalphoresis,which is caused by asymmetric temperature gradient that generated by catalytic reaction.Combine with the catalytic kinetic results,the stochastic model describing the relationship between catalytic reaction rate and diffusion coefficients was established.Thirdly,the influence of LSPR on catalytic activity was investigated by recruiting catalytic glucose oxidation by Au NPs as a model.We found an undiscovered role of hot holes,in which hot holes energetically favors the dissociation of catalytic intermediates from NPs surfaces that recovers its catalytic activity.Density functional theory(DFT)calculation and extend X-ray absorption fine structure analysis revealed that the LSPR excitation furnished a more efficient electron transfer pathways by exciting hot electron/hole pairs,which accelerates the reaction rate and prevents catalysts deactivating.At last,a summary and prospect about relevant research was performed.There is plenty of potential application for nanoplasmonic materials.