Please use this identifier to cite or link to this item: https://doi.org/10.1039/c7nr04245k
Title: Probing nanoscale functionalities of metal-organic framework nanocrystals
Authors: Sun, Y 
Hu, Z 
Zhao, D 
Zeng, K 
Keywords: Crystalline materials
Crystallography
Electromechanical devices
Ferroelectricity
Hafnium
MEMS
Nanotechnology
Organic polymers
Organometallics
Piezoelectricity
Scanning probe microscopy
Thermodynamic stability
Experimental investigations
Ferroelectric hysteresis
Metal organic framework
Metalorganic frameworks (MOFs)
Micro electromechanical system (MEMS)
Piezoelectric coefficient
Piezoresponse force microscopy
Polarization switching
Nanocrystals
Issue Date: 2017
Publisher: Royal Society of Chemistry
Citation: Sun, Y, Hu, Z, Zhao, D, Zeng, K (2017). Probing nanoscale functionalities of metal-organic framework nanocrystals. Nanoscale 9 (33) : 12163-12169. ScholarBank@NUS Repository. https://doi.org/10.1039/c7nr04245k
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). This journal is © The Royal Society of Chemistry.
Source Title: Nanoscale
URI: https://scholarbank.nus.edu.sg/handle/10635/174419
ISSN: 2040-3364
DOI: 10.1039/c7nr04245k
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