The quality of graphene products is worrying, and NUS researchers have confirmed that their purity is too low.
Since the two discoverers won the Nobel Prize in 2010, the global research and development of graphene preparation, modification and application has been launched, and it has been highly anticipated by the industry, governments, internationally renowned companies and the public. The market has set off a wave of enthusiasm. But recently, new research shows that the quality of most commercial graphene products on the market is not enough.
The study was conducted by the National University of Singapore (NUS), which used electron microscopy, atomic force microscopy, Raman spectroscopy, elemental analysis, X-ray photoelectron spectroscopy, and scanning and transmission electron microscopy to produce graphite from 60 different suppliers in the Americas, Asia and Europe. The olefin powders were analyzed and finally they determined that most of the powder samples had less than 10% graphene flakes and only one sample had graphene flakes above 40%.
This will have a big impact. For example, when graphene powder is used in the study of the potential use of graphene, the results will not only be affected by the low content of graphene, but also by the use of different amounts of powder in different institutions. Even more complicated is that some samples also contain chemicals for production.
In this regard, Professor Antonio Castro Neto, the chief scientist of the study, said: "This is the first statistical analysis of global graphene sheet production. Considering that graphene may be able to solve problems related to health, climate and sustainable development. We hope that manufacturers will not hinder research in this way, but will be able to establish uniform standards."
As a new type of two-dimensional nanomaterial, graphene has great application potential and revolutionary changes in many fields such as electronic information, new materials, new energy, biomedicine, and environmental protection.
At present, more than 80 countries around the world have invested in the research and development and production of graphene. The United States, the European Union, Japan, South Korea, etc. have successively published or funded a series of related research projects and projects. In particular, the European Union has developed a graphene flagship plan with a planned investment of 1 billion euros. The top three of the world's most comprehensive R&D and production of graphene are the United States, Japan, and China. Not only that, but IBM, Intel, Dow Chemical, Samsung and other internationally renowned multinational companies have taken graphene and its application technology as a long-term strategic development direction, and a large number of institutions and enterprises specializing in R&D, production and application of graphene have emerged. .
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