期刊
MATERIALS
卷 14, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/ma14081916
关键词
graphene; graphene oxide; particle size; stability; standardization; surface chemistry; nanomaterials
类别
资金
- FEDER funds through the COMPETE 2020-Operacional Programme for Competitiveness and Internationalisation (POCI), Portugal 2020
- national funds (PIDDAC) through FCT/MCTES [POCI-01-0145-FEDER-031143]
- Laboratory for Process Engineering, Environment, Biotechnology and Energy-LEPABE [UIDB/00511/2020]
- i3S Scientific Platforms and respective funding: HEMS, member of the national infrastructure PPBI-Portuguese Platform of Bioimaging [POCI-01-0145-FEDER-022122]
- Biointerfaces and Nanotechnology (BN) Laboratory, Portuguese Funds through FCT [UID/BIM/04293/2019]
- Portuguese Foundation for Science and Technology (FCT) [CEECIND/03908/2017]
This study explored high-power ultrasonication as a method for reducing the particle size of graphene oxide (GOn), resulting in improved stability and process yield. Chemical characterization identified characteristic oxygen functional groups in GOn.
Nanographene oxide (GOn) constitutes a nanomaterial of high value in the biomedical field. However, large scale production of highly stable aqueous dispersions of GOn is yet to be achieved. In this work, we explored high-power ultrasonication as a method to reduce particle size of GO and characterized the impact of the process on the physicochemical properties of the material. GOn was obtained with lateral dimensions of 99 +/- 43 nm and surface charge of -39.9 +/- 2.2 mV. High-power ultrasonication enabled an improvement of stability features, particularly by resulting in a decrease of the average particle size, as well as zeta potential, in comparison to GO obtained by low-power exfoliation and centrifugation (287 +/- 139 nm; -29.7 +/- 1.2 mV). Remarkably, GOn aqueous dispersions were stable for up to 6 months of shelf-time, with a global process yield of 74%. This novel method enabled the production of large volumes of highly concentrated (7.5 mg mL(-1)) GOn aqueous dispersions. Chemical characterization of GOn allowed the identification of characteristic oxygen functional groups, supporting high-power ultrasonication as a fast, efficient, and productive process for reducing GO lateral size, while maintaining the material's chemical features.
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