https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39803 1 nanoprobe for noninvasive visualization of biological events. However, the structure–relaxivity relationship and regulatory mechanism of UFNPs remain elusive. Herein, we developed chemically engineered 3.8 nm ZnxFe₃–xO4@ZnxMnyFe_3–x–x–yO₄ (denoted as Zn_xF@Zn₄Mn₄F) nanoparticles with precise dopants control in both crystalline core and disordered shell as a model system to assess the impact of dopants on the relaxometric properties of UFNPs. It is determined that the core–shell dopant architecture allows the optimal tuning of r1 relaxivity for Z_0.40.4F@Zn_0.40.4Mn_0.2F up to 20.22 mM^–1 s^–1, which is 5.2-fold and 6.5-fold larger than that of the original UFNPs and the clinically used Gd-DTPA. Moreover, the high-performing UFNPs nanoprobe, when conjugated with a targeting moiety AMD3100, enables the in vivo MRI detection of small lung metastasis with greatly enhanced sensitivity. Our results pave the way toward the chemical design of ultrasensitive T₁ nanoprobe for advanced molecular imaging.]]> Wed 10 Aug 2022 13:11:25 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48318 Tue 14 Mar 2023 15:37:36 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45389 2O₃ films were deposited using a pulsed laser deposition system. X-ray diffraction and transmission electron microscopy analysis show that the films deposited under oxygen partial pressures of 10^–3 and 10^–5 Torr are uniform without clusters or secondary phases. However, the film deposited under 10^–7 Torr has a Fe-rich phase at the interface. Magnetic measurements demonstrate that the magnetization of the films increases with decreasing oxygen partial pressure. Muon spin relaxation (μSR) analysis indicates that the volume fractions of the ferromagnetic phases in PO₂ = 10^–3, 10^–5, and 10^–7 Torr-deposited samples are 23, 49, and 68%, respectively, suggesting that clusters or secondary phases may not be the origin of the ferromagnetism and that the ferromagnetism is not carrier-mediated. We propose that the formation of magnetic bound polarons is the origin of the ferromagnetism. In addition, both μSR and polarized neutron scattering demonstrate that the Fe-rich phase at the interface has a lower magnetization compared to the uniformly distributed phases.]]> Tue 08 Nov 2022 09:39:02 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49938 Thu 15 Jun 2023 16:14:47 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:41089 Fri 22 Jul 2022 17:18:26 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:48904 Fri 14 Apr 2023 15:38:15 AEST ]]>