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

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    11 Citations (Scopus)


    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
    Publication statusPublished - 2016 Oct 18

    ASJC Scopus subject areas

    • General


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