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Probing nanoscale functionalities of metal–organic framework nanocrystals

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Abstract

Experimental investigation of functional properties of metal–organic frameworks (MOFs) at nanoscale precision is challenging and rarely reported. In this study, we report the piezo- and ferroelectric properties of NUS-6 MOF nanocrystals using dual AC resonance tracking piezoresponse force microscopy and piezoresponse force spectroscopy for the first time. Both NUS-6-(Hf) and NUS-6-(Zr) nanocrystals displayed anomalous piezoelectricity with the calculated piezoelectric coefficient dzz constants of 2.0–3.5 pm V−1 and 1.5–2.5 pm V−1, respectively. Moreover, NUS-6-(Hf) showed much better polarization-switching behaviors (ferroelectricity) than NUS-6-(Zr), featured by very low coercive biases in the ferroelectric hysteresis (PR) loop. Furthermore, elasticity and thermal stability of the NUS-6 nanocrystals have been presented. The results have opened a realm of probing piezo- and ferro-electric properties as well as mechanical properties of MOF nanocrystals, which are promising materials for applications in integrated microelectromechanical systems (MEMS).

Graphical abstract: Probing nanoscale functionalities of metal–organic framework nanocrystals

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Publication details

The article was received on 14 Jun 2017, accepted on 31 Jul 2017 and first published on 01 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR04245K
Citation: Nanoscale, 2017, Advance Article
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    Probing nanoscale functionalities of metal–organic framework nanocrystals

    Y. Sun, Z. Hu, D. Zhao and K. Zeng, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR04245K

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