화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.103, No.1, 258-265, 2020
SrAl12O19: Fe3+ @3-aminopropyl triethoxysilane: Ambient aqueous stable near-infrared persistent luminescent nanocomposites
Near-infrared (NIR) persistent luminescent nanoparticles (N-PLNPs) endow a long-term in vivo imaging with deep tissue penetration and high signal to noise ratio. However, synthesis route and applicable afterglow center for N-PLNPs are still limited. Here, we report on a new synthesis by employing chemical precipitation as the central pivot, which is simpler and has controllable and reproducible routes than the existing technique. We also introduce Fe3+ ion as a new member to join the group of afterglow emitters. Although its NIR luminescence is ubiquitous, its NIR afterglow is still almost never reported. In this paper, SrAl12O19: Fe3+ N-PLNPs display a NIR persistent luminescence from 750 to 1000 nm, which is assigned to T-4(1)((4)G)->(6)A(1)(S-6) transition of Fe3+. Furthermore, a surface-amination technique is proposed to improve the stability of SrAl12O19: Fe3+ N-PLNPs in aqueous solution. After encapsulating the N-PLNPs with 3-aminopropyl triethoxysilane (APTES), SrAl12O19: Fe3+ @APTES nanocomposites exhibit a hydrophilic stability beyond 20 days in aqueous solution. The results make them valuable in studying the biological functions of biomolecules and monitoring cellular networks in their native contexts.