Volume 20, Issue 43 2402940
Research Article

Magnetic Tunability via Control of Crystallinity and Size in Polycrystalline Iron Oxide Nanoparticles

Minh Dang Nguyen

Minh Dang Nguyen

Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Liangzi Deng

Liangzi Deng

Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Jong Moon Lee

Jong Moon Lee

Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Karla M. Resendez

Karla M. Resendez

Department of Biomedical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Maggie Fuller

Maggie Fuller

Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Supawitch Hoijang

Supawitch Hoijang

Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200 Thailand

Search for more papers by this author
Francisco Robles-Hernandez

Francisco Robles-Hernandez

College of Engineering Technology, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Ching-Wu Chu

Ching-Wu Chu

Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Dmitri Litvinov

Dmitri Litvinov

Department of Electrical and Computer Engineering, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Viktor G. Hadjiev

Viktor G. Hadjiev

Department of Mechanical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Shoujun Xu

Shoujun Xu

Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

Search for more papers by this author
Manh-Huong Phan

Manh-Huong Phan

Department of Physics, University of South Florida, Tampa, FL, 33620 USA

Search for more papers by this author
T. Randall Lee

Corresponding Author

T. Randall Lee

Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003 USA

E-mail: [email protected]

Search for more papers by this author
First published: 14 July 2024
Citations: 14

Abstract

Iron oxide nanoparticles (IONPs) are widely used for biomedical applications due to their unique magnetic properties and biocompatibility. However, the controlled synthesis of IONPs with tunable particle sizes and crystallite/grain sizes to achieve desired magnetic functionalities across single-domain and multi-domain size ranges remains an important challenge. Here, a facile synthetic method is used to produce iron oxide nanospheres (IONSs) with controllable size and crystallinity for magnetic tunability. First, highly crystalline Fe3O4 IONSs (crystallite sizes above 24 nm) having an average diameter of 50 to 400 nm are synthesized with enhanced ferrimagnetic properties. The magnetic properties of these highly crystalline IONSs are comparable to those of their nanocube counterparts, which typically possess superior magnetic properties. Second, the crystallite size can be widely tuned from 37 to 10 nm while maintaining the overall particle diameter, thereby allowing precise manipulation from the ferrimagnetic to the superparamagnetic state. In addition, demonstrations of reaction scale-up and the proposed growth mechanism of the IONSs are presented. This study highlights the pivotal role of crystal size in controlling the magnetic properties of IONSs and offers a viable means to produce IONSs with magnetic properties desirable for wider applications in sensors, electronics, energy, environmental remediation, and biomedicine.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.