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Feng Chen, Wenbo Bu, Shengjian Zhang, Jianan Liu, Wenpei Fan, Liangping Zhou, Weijun Peng and Jianlin Shi Gd3+-Ion-Doped Upconversion Nanoprobes: Relaxivity Mechanism Probing and Sensitivity Optimization Advanced Functional Materials 23

Version of Record online: 23 AUG 2012 | DOI: 10.1002/adfm.201201469

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Relaxivity mechanism probing shows that longitudinal relaxivity enhancement of Gd3+-doped upconversion nanoparticles (UCNPs) originates from inner- and outer-sphere mechanisms for ligand-free probes, and mainly from an outer-sphere mechanism for silica-shielded probes. The origin of transverse relaxivity is inferred to be mainly from an outer-sphere mechanism, regardless of surface-modification but with the transverse relaxivity (r2) values highly related to the surface-state.

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