Research ArticleCONDENSED MATTER PHYSICS

Simultaneous implementation of resistive switching and rectifying effects in a metal-organic framework with switched hydrogen bond pathway

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Science Advances  02 Aug 2019:
Vol. 5, no. 8, eaaw4515
DOI: 10.1126/sciadv.aaw4515
  • Fig. 1 The illustration of discontinuous hydrogen bonding chains in FJU-23-H2O.

    (A to C) The hydrogen bonding interaction between the lattice water and the framework [color code for oxygen atoms: purple, located in the layer; red, out of the layer; d (O2w⋯O3w) = 2.688(8) Å; d (O3w⋯O21) = 3.005(7) Å; d (O21⋯O4w) = 2.675(9) Å; d (O1w⋯O5w) = 2.570(9) Å; d (O4w⋯O5w) = 2.614(10) Å]. (D) The single honeycomb sheet of Zn1 atoms. (E) Lattice water molecules located in hexagonal nanochannels of FJU-23-H2O. (F) A hydrogen bonding chain fragment. (G) Three-dimensional stack for hydrogen bonding chain fragment along the c axis. Symmetry codes: (#1) −1 + x, −1 + y, z; (#2) x, −1 + y, z; (#3) 1 + xy, x, −0.16667 + z.

  • Fig. 2 Electrical performance of the device of FJU-23-H2O single crystal along the c axis.

    (A) The illustration of electrical performance test. (B) Proton conductivity calculated from ac impedance spectroscopy for FJU-23-H2O under ac voltage of 0.1 V and dc voltage range from 0 to 1 V at 294 K. (C) Semilogarithmic plot of the room-temperature I-V characteristics with 100 consecutive cycles. The red line represents the result of the first round of voltage sweeping. The arrows indicate the sweeping direction, while the numbers 1 to 4 represent the sweeping sequence. ICC stands for the compliance current (ICC = 10−4 A). (D) Endurance performance, (E) the function of set voltage with the cycles, and (F) the histogram and Gaussian fitting curves of the distribution of the set voltage for the same device of one single crystal over 100 consecutive cycles. (G) Retention performance of the three conductance states over 104 s. The resistance of the sample was read at 0.05 V. (H) The comparison of the set voltage and ON/OFF ratio between FJU-23-H2O and some representative RRAM materials, as presented in table S3 (symbol code: ○/●, the devices show the RS with and without rectifying effect).

  • Fig. 3 Structural variation under various dc voltages applied on the same one single crystal of FJU-23-H2O along the c axis.

    (A) The illustration of the applied dc voltages following the sequences as the points from 1 to 7. (B) The change of the electron density peaks near O1w in the original difference Fourier maps (diff) before adding H1w1 and H1w2 under the various dc voltages in the sequence above. The comparison of the distance d [H1w1(O1w)⋯O11] (d1) and d [H1w1(O1w)⋯O31] (d2) (C) and the bond angle θ (O1w─H1w1⋯O11) (θ1) and θ (O1w─H1w1⋯O31) (θ2) (D) in FJU-23-H2O under various dc voltages.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/5/8/eaaw4515/DC1

    Fig. S1. Structure and electrical performance of FJU-23-H2O single crystal.

    Fig. S2. The microscopic image of the experimental setup.

    Fig. S3. Variations of distance (H1w1⋯O31) and bond angle (O1w─H1w1⋯O11) under various dc voltages applied on the same one single crystal of FJU-23-H2O along the c axis.

    Fig. S4. Structure and electrical performance of FJU-23-D2O single crystal.

    Fig. S5. The characterization of FJU-23-H2O.

    Table S1. Selected bond lengths (Å) and bond angles (°) for O1w.

    Table S2. Selected bond lengths (Å) and bond angles (°) for O3w.

    Table S3. Performance parameters for some representative RRAMs.

    Table S4. Crystal data and structure refinement for FJU-23-H2O, FJU-23-D2O, and FJU-23-H2O under voltage sweeping on one single crystal.

  • Supplementary Materials

    This PDF file includes:

    • Fig. S1. Structure and electrical performance of FJU-23-H2O single crystal.
    • Fig. S2. The microscopic image of the experimental setup.
    • Fig. S3. Variations of distance (H1w1⋯O31) and bond angle (O1w─H1w1⋯O11) under various dc voltages applied on the same one single crystal of FJU-23-H2O along the c axis.
    • Fig. S4. Structure and electrical performance of FJU-23-D2O single crystal.
    • Fig. S5. The characterization of FJU-23-H2O.
    • Table S1. Selected bond lengths (Å) and bond angles (°) for O1w.
    • Table S2. Selected bond lengths (Å) and bond angles (°) for O3w.
    • Table S3. Performance parameters for some representative RRAMs.
    • Table S4. Crystal data and structure refinement for FJU-23-H2O, FJU-23-D2O, and FJU-23-H2O under voltage sweeping on one single crystal.

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