Fabrication Of Plasmonic Molybdenum Oxides Quantum Dots And Its Applications

Due to an enhanced electromagnetic field and specific light absorption property,plasmonic materials are expected to be applied on light-matter interaction field.While plasmonic noble metal materials are restricted by their high cost,non-tunable absorption wavelength and instability.Therefore,the researches begin to focus on non-noble metal materials.Among them,transition metal oxides could introduce significant surface plasmon resonance effect and enhanced electromagnetic field,also show an ultrahigh light absorption in near-infrared region,which endow them potential application on different research fields.In this essay,we designed a facile method to fabricate plasmonic HxMoO3 quantum dots with the assistance of supercritical CO2.Further it was applied on different application fields.These researches are listed below.(1)The fabrication of plasmonic HxMoO3 quantum with the assistance of SC CO2 and its application on SERSHerein,for the first time a facile method to fabricate amorphous HxMoO3 quantum dots with tunable plasmon resonance is developed by a controlled oxidization route.The as-prepared amorphous HxMoO3 quantum dots show tunable plasmon resonance in the region of visible and near-infrared light.Moreover,the tunability induced by SC CO2 is analyzed by a molecule kinetic theory combined with a molecular thermodynamic model.More importantly,the ultrahigh enhancement factor of amorphous HxMoO3 quantum dots detecting on methyl blue can be up to 9.5 × 105 with expending the limit of detection to 10-9 M.Such a remarkable property can also be found in this HxMoO3-based sensor with Rh6G and RhB as probe molecules,suggesting that the amorphous HxMoO3 quantum dot is an efficient candidate for SERS on molecule detection in high precision.(2)HxMoO3 quantum dots' application on cancer photothermal therapyIn this work,the HxMoO3 quantum dots with near-infrared light absorption prepared under the assistance of SC CO2 was applied on cancer photothermal therapy.After photothermal property measurement,the HxMoO3 quantum dots solution could possess an ultrahigh photothermal conversion efficiency of 85.7%.Then it was applied on NIR cancer photothermal therapy and the cancer cell viability was reduced under 20%without the use of anticancer drugs,which could investigate its excellent treatment effect.(3)The fabrication of multifunctional HxMoO3/PNIPAM hydrogel and its applicationsIn this work,the HxMoO3 quantum dots was combined with PNIPAM hydrogel to obtain HxMoO3/PNIPAM hydrogel composite with photothermal property,tough bonding force and self-healing property.Then the composite was found to be beneficial to the growth of inflammatory cells.The results showed that HxMoO3/PNIPAM hydrogel composite possessed outstanding photothermal property and stability.Plus,it showed excellent bonding force on different surface,including pore surface and non-pore surface,especially human being's skin.Based on the above,supercritical fluid technology opens a new direction for the fabrication of plasmonic materials,and these plasmonic materials will be applied on spectrum detection,cancer therapy and multifunction material's fabrication potentially.