As is made evident by the size of the bubbles in this infographic (illustrating the total number of nano-articles published by each country), China, the United States, India, Iran, and South Korea possessed the largest volumes of nano-articles published in 2016-2020, respectively.
In terms of the H-index, China, the USA, Australia, Singapore and Germany ranked first to fifth, whereas regarding the average rate of reference to nano-articles over the last 5 years, it is Singapore, Australia, the USA, and Switzerland which are leading.
As can be seen, apart from the United States and China, the position of countries such as Australia, Switzerland, and the Netherlands indicates a greater amount of emphasis being placed by their researchers on higher-impact scientific achievements; this is while countries such as Russia, Brazil, and even India are not in a very favorable situation as regards this indicator.
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Source
Five Year H-Index of Nanotechnology Publications Indicator
Five Year Average Citation per Nano-article Indicator
China
USA
Singapore
Australia