Field effect transistor based on proton conductive metal organic framework (CuBTC)

Abstract

Metal organic frameworks (MOFs) are crystalline materials with ultrahigh porosity and tunable physico-chemical properties. But most MOFs are electrical insulators which restricts their use in electronic devices. In the present study, a field effect transistor (FET) based on a proton-conductive MOF was investigated. Imidazole was used as a proton conductor to increase the conductivity of the copper benzene tricarboxylate (CuBTC) MOF and, further, it was used to develop the FET. The CuBTC was synthesized using the traditional solvothermal method. The proton-conductive MOF was synthesized by post-modification of the CuBTC via the pore filling method using imidazole molecules, which achieved a proton conductivity of ~1.04 × 10 −4 S cm −1 at 70 °C (anhydrous conditions). The proton conductive MOF was characterized by various techniques; spectroscopically by Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, x-ray absorption spectroscopy, energy dispersive spectroscopy, alternating current (a.c.) impedance spectroscopy; thermally using thermogravimetric analysis; structurally using powder x-ray diffraction; morphologically using field emission scanning electron microscopy; electrically by FETs.

Heterometallic Actinide‐Containing Photoresponsive Metal‐Organic Frameworks: Dynamic and Static Tuning of Electronic Properties

“…In our report, we used TCNQ as a guest in MOFs with Th 4+ and Zr 4+ metal nodes that are resistant to further oxidation and as such, the guest‐guest or ligand‐guest interactions would likely be the primary mode of conductivity enhancement. Experimental measurements for TCNQ‐integrated Th‐MOF (2.4 TCNQ molecules per pore determined using the digestion procedure followed by 1 H NMR spectroscopic analysis) revealed a 66‐fold increase in conductivity compared to the parent Th‐MOF, which is in line with the data obtained for TCNQ‐integrated Zr‐MOF and expected based on literature reports [70] . We also anticipated that changes between photoisomers with vastly different dipole moments upon irradiation could also affect CT processes, [41, 44] and changes in conductivity could reveal it.…”

“…We exploited the concept of tunable conductivity observed in photochromic MOFs and facilitated a guest‐induced field‐effect response, each of which has previously been considered independently in other MOFs, [43, 70] to build a “fail‐safe” circuit powered by our TCNQ@Zr‐65 %‐FET (Scheme 1 c). As a model system to detect and report hazardous conditions, the circuit has a constantly illuminated red LED (indicating flow of current to a target device) and a “switchable” green LED that toggles as a function of UV stimulus (Figures 4 a and b).…”

Heterometallic Actinide‐Containing Photoresponsive Metal‐Organic Frameworks: Dynamic and Static Tuning of Electronic Properties

“…Experimental measurements for TCNQ-integrated Th-MOF (2.4 TCNQ molecules per pore determined using the digestion procedure followed by 1 HNMR spectroscopic analysis) revealed a6 6-fold increase in conductivity compared to the parent Th-MOF,w hich is in line with the data obtained for TCNQ-integrated Zr-MOF and expected based on literature reports. [70] We also anticipated that changes between photoisomers with vastly different dipole moments upon irradiation could also affect CT processes, [41,44] and changes in conductivity could reveal it. Therefore,w ec arried out experiments to measure the conductivity of photochromic actinide frameworks containing redox-active guest moieties (TCNQ@Th-65 %).…”

“…We exploited the concept of tunable conductivity observed in photochromic MOFs and facilitated aguest-induced field-effect response,e ach of which has previously been considered independently in other MOFs, [43,70] to build a"failsafe" circuit powered by our TCNQ@Zr-65 %-FET (Scheme 1c). As am odel system to detect and report hazardous conditions,t he circuit has ac onstantly illuminated red LED (indicating flow of current to at arget device) and a" switchable" green LED that toggles as af unction of UV stimulus (Figures 4a and b).…”

Sulfur Dioxide (SO2) Detection Using Composite of Nickel Benzene Carboxylic (Ni3BTC2) and OH-Functionalized Single Walled Carbon Nanotubes (OH-SWNTs)

“…During the last two decades, Metal-Organic frameworks (MOFs) have attracted considerable attention among research communities due to their unique tunable physical and chemical properties which build on the selecting organic linker and central metal (Campbell et al, 2015;Avery et al, 2016;Bodkhe et al, 2019). MOFs have large surface areas with high porosity.…”