作者单位:Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan S9, 9000 Ghent, Belgium[1]Center for Nano- and Biophotonics, Ghent University, Sint-Pietersnieuwstraat 25, 9000 Ghent[2]Lab General Biochemistry and Physical Pharmacy, Ghent University, Harelbekestraat 72, 9000 Ghent[3]MoSAIC/Biomedical NMR Unit, Department of Medicine, Catholic University of Leuven, Herestraat 49[4]