Oligomer Hydrate Crystallization Improves Carbon Nanotube Memory

Document Type

Article

Publication Date

5-22-2018

Publication Title

Chemistry of Materials

Volume

30

Issue

11

First page number:

3813

Last page number:

3818

Abstract

Single-walled carbon nanotube (SWCNT) field-effect transistor (FET) devices have potential for memory storage applications. Devices fabricated with semiconducting SWCNT ink using dielectrophoresis were coated with a renewably sourced poly(oxacyclobutane) oligomer. It was found that this oligomer crystallizes with water to form a semicrystalline oligomer hydrate material. Crystallization also occurs on the SWCNT device surface in ambient conditions, resulting in dramatically increased hysteresis of the SWCNT-FET I-Vg curves. Using alternating current impedance measurements, we found that the oligomer hydrate crystals store charge, acting as a capacitor encapsulating the nanotube network. This capacitive material can serve to electrostatically gate the SWCNT network. The charge storage properties of the oligomer hydrate crystals were applied to store “0” and “1” bits separated by ∼4 orders of magnitude of current. Utilizing powder X-ray diffraction and simulation, we have demonstrated that this semicrystalline material contains aligned, hydrogen-bonded one-dimensional columns of water molecules which allows for charging of the material through electrostatic gating by mobile protons in the crystal structure.

Disciplines

Chemistry | Engineering

Language

English

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