ACS_Applied Materials & Interfaces

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ACS_Applied Materials & Interfaces

December 8, 2021

Volume 13, Issue 48

Pages 56719-58252



Si Isotope-Enriched Silicon Nanoparticles for an Efficient Hyperpolarized Magnetic Resonance Imaging


Silicon particles have garnered attention as promising biomedical probes for hyperpolarized 29Si magnetic resonance imaging and spectroscopy. However, due to the limited levels of hyperpolarization for nanosized silicon particles, microscale silicon particles have primarily been the focus of dynamic nuclear polarization (DNP) applications, including in vivo magnetic resonance imaging (MRI). To address these current challenges, we developed a facile synthetic method for partially 29Si-enriched porous silicon nanoparticles (NPs) (160 nm) and examined their usability in hyperpolarized 29Si MRI agents with enhanced signals in spectroscopy and imaging. Hyperpolarization characteristics, such as the build-up constant, the depolarization time (T1), and the overall enhancement of the 29Si-enriched silicon NPs (10 and 15%), were thoroughly investigated and compared with those of a naturally abundant NP (4.7%). During optimal DNP conditions, the 15% enriched silicon NPs showed more than 16-fold higher enhancements─far beyond the enrichment ratio─than the naturally abundant sample, further improving the signal-to-noise ratio in in vivo29Si MRI. The 29Si-enriched porous silicon NPs used in this work are potentially capable to serve as drug-delivery vehicles in addition to hyperpolarized 29Si in vivo, further enabling their potential future applicability as a theragnostic platform.


  • Jiwon Kim
  •  Donghyuk Jo
  • Seung-Hyun Yang
  • Chan-Gyu Joo
  • Nicholas Whiting
  • Shivanand Pudakalakatti
  • Hyeonglim Seo
  • Hye Young Son
  •  Sun-Joon Min
  • Pratip Bhattacharya
  • Yong-Min Huh
  •  Jeong Hyun Shim
  • Youngbok Lee



29Si Isotope-Enriched Silicon Nanoparticles for an Efficient Hyperpolarized Magnetic Resonance Imaging Probe | ACS Applied Materials & Interfaces


Image created by minjeong Kim / Nanosphere