Electroactive polyoxometalate-based molecular layers for nano-electronics
Polyoxometalates (POMs) are nano-scaled metal-oxides, considered as promising candidates in many application fields thanks to their electron reservoir and redox properties. When turned into hybrids, by adding at least one organic arm, POMs can be used as platforms for the synthesis of larger devi...
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| Format: | Thesis-Doctor of Philosophy |
| Language: | English |
| Published: |
Nanyang Technological University
2022
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| Online Access: | https://hdl.handle.net/10356/155313 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Polyoxometalates (POMs) are nano-scaled metal-oxides, considered as promising
candidates in many application fields thanks to their electron reservoir and redox properties.
When turned into hybrids, by adding at least one organic arm, POMs can be used as platforms
for the synthesis of larger devices. This thesis, realized in co-tutelle between Sorbonne
Université and Nanyang Technological University, presents the results of this PhD work
focusing on two aspects of POMs-based hybrids integration in large systems for different
applications. Firstly, the formation of auto-assembled discrete species and their aggregation
under specific solvent conditions was investigated. While on one hand a gel was obtained
(organo- or hydro-), on the other hand square-shaped structure were obtained, leading to
vesicles or elongated cherry-branches according to the solvent. Secondly, the covalent grafting
of POM-based hybrids on ITO substrates for the formation of memory devices was studied.
After confirmation of the thickness and the characteristics of the grafted layer via a panel of
techniques (SEM, AFM, XPS…), a top electrode was deposited to measure the memory
properties of the final system. It confirmed the resistive memory nature, the non-volatility of the
device and the “write once read many” character, where an information can be stored but not
erased. |
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