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. 2021 Sep 20;11(9):2449. doi: 10.3390/nano11092449

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Three components (i.e., Gd-NPs, PAA, and Rho) of the ultrasmall Gd-NPs colloid, the role of each component, and the surface coating structure. (b) Three applications of the ultrasmall Gd-NPs colloid. Reprinted from [135].