Metal-Organic Framework Assembled on Oriented Nanofiber Arrays for Field-Effect Transistor and Gas Sensor-Based Applications

Abstract

Metal–organic framework (MOF) films are essential for numerous sensor and device applications. However, metal-organic framework materials have poor machinability due to their predominant powder-like nature, and their presence as the active layer in a device can seriously affect the performance and utility of the device. Herein, active layers of field-effect transistor (FETs) devices and chemiresistor gas sensors with high performance were constructed by loading Cu3(HITP)2 (HITP = 2,3,6,7,10,11-hexaiminotriphenylene) in situ-axial anchoring on oriented nanofiber arrays prepared via electrospinning. The strong interaction between polar groups on the polymer chains and metal ions promotes the nucleation of Cu3(HITP)2, steric hindrance makes particles of Cu3(HITP)2 with uniform size, morphology, and good crystallinity during nucleation by liquid phase epitaxial growth (LPE). Influences of differently-oriented Cu3(HITP)2 NFAs-based FETs on the electrical properties were studied, optimally oriented Cu3(HITP)2 NFAs-based FETs showed good mobility of 5.09 cm2/V·s and on/off ratio of 9.6 × 103. Moreover, excellent gas sensing response characteristics were exhibited in sensing volatile organic compounds (VOCs). Chemiresistor gas sensors with high response value, faster response and recovery are widely suited for VOCs. It brings new inspirations for the design and utilization of electrically conductive MOFs as an active layer for FETs and sensor units for chemiresistor gas sensors.

Metal–Organic Framework Coated Devices for Gas Sensing

“…The current of the leakage electrode changed distinctly in the presence of SO 2 with a detection limit of 625 ppb. Zhou et al synthesized highly oriented Cu 3 (HITP) 2 nanofiber arrays (NFAs) via the liquid phase epitaxial growth. The carrier mobility of Cu 3 (HITP) 2 NFAs coated FETs was up to 5.09 cm 2 V –1 s –1 and the on/off ratio was around 9.6 × 10, and the sensors exhibited excellent response and recovery in detecting VOCs.…”

Rapid and Selective Sensing of 2,4,6-Trinitrophenol via a Nano-Plate Zn(II)-Based MOF Synthesized by Ultrasound Irradiation

“…This interest is relying on their intrinsic high porosity coupled with their stability and functionality achieved by the rational selection of the network structural units [4][5][6][7]. Recently, many efforts have been made to invent new synthetic methods to control the size and morphology of MOFs [8,9]. Different morphologies such as nanospheres, nanorods, nano-plates, and nanotubes in MOF nanostructures can influence their chemical and physical properties, leading to many potential applications [10][11][12].…”

Sensitive Detection of a Gaseous Analyte with Low‐Power Metal–Organic Framework Functionalized Carbon Nanotube Transistors

“…The substantial innovation of this work is to provide a universal platform that is based on a high-performance carbon nanotube FET onto which any type of MOF can be grown. There have been a few recent reports where MOFs have been grown on nanowire FETs, organic FETs, MoS 2 -FET, [13][14][15] and on graphene-FETs. [2] But up to now, no work has been reported where MOFs have been grown on CNTFETs.…”