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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-Fe 2 O 3 /Au core/shell (γ-Fe 2 O 3 @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 (T 2 ) were influenced by the presence of γ-Fe 2 O 3 @Au nanoparticles. Unlike the spin–spin relaxation rate (1/T 2 ), the spin–lattice relaxation rate (1/T 1 ) was found to be further enhanced upon exposing the γ-Fe 2 O 3 @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 T 2  in low-field (LF) MRI applications.

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