Influence of magnetoplasmonic γ-Fe2O3/Au core/shell nanoparticles on low-field nuclear magnetic resonance

Kuen Lin Chen*, Yao Wei Yeh, Jian Ming Chen, Yu Jie Hong, Tsung Lin Huang, Zu Yin Deng, Chiu Hsien Wu, Su Hsien Liao, Li Min Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Magnetoplasmonic nanoparticles, composed of a plasmonic layer and a magnetic core, have been widely shown as promising contrast agents for magnetic resonance imaging (MRI) applications. However, their application in low-field nuclear magnetic resonance (LFNMR) research remains scarce. Here we synthesised γ-Fe2O3/Au core/shell (γ-Fe2O3 @Au) nanoparticles and subsequently used them in a homemade, high-T c, superconducting quantum interference device (SQUID) LFNMR system. Remarkably, we found that both the proton spin-lattice relaxation time (T 1) and proton spin-spin relaxation time (T2) were influenced by the presence of γ-Fe2O3 @Au nanoparticles. Unlike the spin-spin relaxation rate (1/T2), the spin-lattice relaxation rate (1/T 1) was found to be further enhanced upon exposing the γ-Fe2O3 @Au nanoparticles to 532 nm light during NMR measurements. We showed that the photothermal effect of the plasmonic gold layer after absorbing light energy was responsible for the observed change in T 1. This result reveals a promising method to actively control the contrast of T 1 and T2 in low-field (LF) MRI applications.

Original languageEnglish
Article number35477
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Oct 18

ASJC Scopus subject areas

  • General

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