Metal-organic Frameworks Electronic Components And Its Properties

Metal organic frameworks?MOFs?have great potential in fabricating electronic components and revealing the relationship between structure and performance of devices due to their orderly and adjustable structures,but their application in electronic components has received less attention.In particular,the current research on MOF-based resistive random-access memory?RRAM?and photodetector is in its infancy,and it is still desirable to improve their performance and reveal relationship between structures with performance.In this paper,we aim to study the formation of double-resistance states in MOFs and apply them to RRAM and photodetector.The performance of MOFs based RRAM or photodetector can be regulated by structural regulation of MOFs.The relationship between MOFs structure and RRAM/photodetector performance is studied,by going insight into structural changes of MOFs under electric field or light illumination,which provides a theoretical basis for the development of high performance MOFs based RRAM or photodetectors.The specific results are summarized as follows:1.The use of proton-conducting MOFs as a medium endows the RRAM a smaller set voltage.The bipolar resistance switching behavior was observed in an RRAM cell in which a proton-conducting MOF{[Me₂NH₂)₃?SO₄?]₂[Zn₂?ox?₃]}_n?compound 1?having a rich hydrogen bonding network was used as a medium.Further,using polyvinyl alcohol as a matrix,a RRAM cell using a compound 1@PVA mixed matrix film as medium was prepared,and its set voltage was mainly concentrated at 0.3V.2.The proton transport pathway is adjusted to achieve both resistance switching and rectifying effects.FJU-23 with a discontinuous hydrogen bonding chain was constructed based on ligand 5-?4H-1,2,4-triazol-4-yl?isophthalic acid?5-TIA?and used as a medium for RRAM.The both resistance switching and rectifying effects can be observed with on/off ratio and rectifying of 10⁵.Moreover,the FJU-23 based RRAM exhibits an ultralow set voltage of 0.2V.Single crystal X-ray diffraction?SCXRD?analyses reveal that the resistance switching behavior is originated from the turn on/off of the switched hydrogen bond pathway under the stimulus of DC voltages.3.Photochromic MOFs act as active components of photodetectors.Photochromic MOF FJU-67 with five-fold interpenetrated structures was used as a photodetector,and its anisotropic photoelectric response was found.The on/off ratio of light/dark current can be adjust by functionalizing FJU-67 with amino group or adjusting the structure with four-fold interpenetrated structures.Structural analysis shows that the the?-?interaction in framework has a significant effect on the on/off ratio of light/dark.This work expands the range of applications of photochromic MOFs and guides the synthesis of photodetectors based on photochromic MOFs.4.FJU-22 constructed from 5-TIA ligand can effectively separate C₂H₂/CO₂ and C₂H₂/C₂H₄ mixed gases.The separation capacity of FJU-22a for 50:50 C₂H₂/CO₂mixtures is 44.13 cm³/g and the actual selectivity of FJU-22a for C₂H₂/C₂H₄ mixtures containing 1%C₂H₂ is 25.8.First-principles calculations indicate that its specific recognition of acetylene gas results from its hydrogen-bonding interaction with the open O donor site toward the pore and the hydrogen atom at the end of the acetylene molecule.