Controlled synthesis of Cu-/Ni-based 1D c-MOFs and their application in near-linear temperature sensing

In this paper, the Cu-/Ni-based one-dimensional (1D) conductive metal-organic frameworks (c-MOFs) nanorods (Cu3(HHTP)2/Ni3(HHTP)2) have been synthesized successfully through a one-pot hydrothermal method. The effect of reaction time, MOFs compositions and ratio of solvent on the performance of Cu3(HHTP)2-/Ni3(HHTP)2- based resistive temperature sensors was studied by sensing platforms. Compared with Ni3(HHTP)2-based sensor, Cu3(HHTP)2-based sensor, which was assembled under DMF volume of 0.5 mL and reaction time of 12 h (Cu7), provided the optimal performance, for example, relative variation of resistance (RVR) near-linearly decreased by 85.9% from 20 °C to 80 °C, and the temperature coefficient of resistance (TCR) reached up −0.0157 °C-1. Moreover, the resistance value of the Cu3(HHTP)2-based sensor is 0.106 kΩ, which exhibited a minimum resistance under different temperatures. These results demonstrate that the use of Ni3(HHTP)2-based 1D c-MOFs for fabrication of temperature sensor provides good conductivity and high thermo-responsive sensitivity. Hence, this study provided an excellent example for the simple preparation and practical application of 1D c-MOFs-based near-linear temperature sensor.