Somers Rebecca C, Snee Preston T, Bawendi Moungi G, Nocera Daniel G
Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139-4307.
Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, MC 111, Chicago IL, 60607.
J Photochem Photobiol A Chem. 2012 Nov 15;248:24-29. doi: 10.1016/j.jphotochem.2012.07.012.
Energy transfer between a CdSe/ZnS nanocrystal (NC) donor and a rhodamine isothiocyanate (RITC) acceptor has been achieved via a functionalized poly(acrylic acid) (PAA) encapsulating layer over the surface of the NC. The modification of PAA with both -octylamine (OA) and 5-amino-1-pentanol (AP), [PAA-OA-AP], allows for the simultaneous water-solubilization and functionalization of the NCs, underscoring the ease of synthesizing NC-acceptor conjugates with this strategy. Photophysical studies of the NC-RITC constructs showed that energy transfer is efficient, with approaching 10 s. The ease of the covalent conjugation of molecules to NCs with PAA-OA-AP coating, together with efficient energy transfer, makes the NCs encapsulated with PAA-OA-AP attractive candidates for sensing applications.
通过在CdSe/ZnS纳米晶体（NC）表面包覆一层功能化的聚丙烯酸（PAA），实现了CdSe/ZnS纳米晶体供体与异硫氰酸罗丹明（RITC）受体之间的能量转移。用辛胺（OA）和5-氨基-1-戊醇（AP）对PAA进行改性，即[PAA-OA-AP]，可使NC同时实现水溶性和功能化，突出了采用该策略合成NC-受体共轭物的简便性。对NC-RITC构建体的光物理研究表明，能量转移效率很高，τ接近10⁻⁸ s。分子通过PAA-OA-AP涂层与NC进行共价共轭的简便性，以及高效的能量转移，使得包覆有PAA-OA-AP的NC成为传感应用的有吸引力的候选材料。
