| With the rapid development of modern economy and industry,Functionalization of single nanomaterial,and composite materials are composed of a variety of nano materials are currently by the focus and the frontier research in research field.Thanks to the core-shell structure,the aggregation of nanoparticles is avoided.Besides improving the stability,the controllable regulation of the function and the unique collaborative performance of these two compositions of this core-shell structure functional nanomaterial are also realized.This dissertation focuses on the design and construct of core-shell structure functional nanomaterials,as well as their optical,electrical and catalytic based properties,and applications in the related field.1.We reported that a simple,low-cost method for the synthesis of Au@PPy core-shell nanoparticles,which not only overcomes the problem of agglomeration of Au nanoparticles in device,but also reveals that Au@PPy core-shell nanoparticles exhibited excellent negative differential resistance(NDR)characteristic by self-assembly technology.The NDR effect can be optimized by adjusting the size of Au and PPy in the core-shell structure,and combined with theoretical simulation techniques to reveal the formation mechanism of the negative differential resistance phenomenon,which can be used to prepare memory storage devices.2.Biocoordination polymer(BCP)nanowires are successfully constructed through self-assembly of chiral cysteine amino acids and Cd cations in solution.The varied chirality of cysteine is explored to endow the difference of BCP nanowires in both morphology and structure.More interestingly and surprisedly,electrical property measurement reveals that though all the Cd(Ⅱ)/cysteine BCP nanowires behave as semiconductors,the conductivity of the Cd(Ⅱ)/DL-cysteine nanowires is four times higher than that of the Cd(Ⅱ)/L-cysteine or Cd(Ⅱ)/D-cysteine ones.The origin of such chirality discriminated characteristics registered in BCP nanowires is further elucidated by theoretical calculation.These findings demonstrate that the morphology,structure and property of BCP nanostructures could be tuned by the chirality of the bridging ligands,which will shed light on comprehension of chirality transcription as well as construction of chirality-regulated functional materials.3.Based on third chapter,Cd(II)/cysteine nano wires BCPs with precise regulation by self-assembly technology were used as template and souce of N and S.We developed an environment friendly route of NSCo-CNT functional nanomaterials with high levels of doping and high specific surface area,moreover,the shell and morphology of NSCo-CNT functional nano materials can be tunned.NSCo-CNT-3 functional nanomaterials shows excellent catalytic performance,with the reduction reaction of p-aminophenol finished within 5 min at room temperation.The strategy for fabrication NSCo-CNT is expected to be of great significance for design and construct core-shell functional nanomaterials with high level doping.4.Uniform yttrium oxide multi-shelled hollow structure were controllably prepared by hydrothermal method and the subsequent calcination.Considering their structural advantages,the methanol detection properties were further investigated based on cataluminescence(CTL).The ultrasensitivity for the methanol detection of MSHSY(limit of detection:71 ppb)was enhanced,compared with that of commercial Y2O3 NPs.Remarkably,this functional nanomaterial exhibits good sensitivity and good selectivity for methanol detection due to more high active sites and the exposed {222} crystal facets.Meanwhile,the simulation results were in agreement with the experimental ones.Moreover,in situ FT-IR spectra sufficient verified that CO2 is final product,which indicates mechanism of YMSHs-dependent methanol CTL reaction.The simplicity and feasibility of this synthesis process is particularly attractive and promising for the designing and fabricating of other materials with excellent gaseous sensing properties. |
