title: Optically encoded nanoprobes using single walled carbon nanotube as the building scaffold for magnetic field guided cell imaging.
abstract: We construct a novel fluorescent, surface enhanced Raman scattering (SERS) encoded and magnetic nanoprobe for live cell imaging. To fabricate this nanoprobe, single walled carbon nanotube (SWNT) is used as the building scaffold while gold nanoparticles (Au NPs), superparamagnetic iron oxide nanoparticles (SPIONs) and quantum dots (QDs) are employed as the building blocks. Here, Au NPs serve as the SERS substrate and QDs act as the fluorescent agent. Au NPs and SPIONs are first adsorbed on the SWNT via electrostatic interactions. Then a silica layer is coated on the SWNT. Finally, QDs are attached on the silica shell. With such a structure, various optical signals can be readily encoded to the nanoprobe simply by using different Raman molecules and QDs with different emission wavelengths. Experimental results show that the as-prepared nanoprobe exhibits well fluorescence and SERS performance. Furthermore, in vitro experiments demonstrate that the nanoprobe can fulfill magnetic field guided fluorescence and SERS dual mode imaging of live cells. As a fascinating optical encoding material and a multifunctional nanoplatform, the presented nanoprobe holds genuine potential in future biosensing applications.
authors.affiliation: Department of Laboratory Medicine, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.affiliation: Advanced Photonics Center, Southeast University, Nanjing 210096, China. Electronic address: wangzy@seu.edu.cn.
authors.forename: Zhuyuan
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Advanced Photonics Center, Southeast University, Nanjing 210096, China.
authors.forename: Minglang
authors.initials: M
authors.lastname: Ye
authors.affiliation: Advanced Photonics Center, Southeast University, Nanjing 210096, China.
authors.forename: Shenfei
authors.initials: S
authors.lastname: Zong
authors.affiliation: Advanced Photonics Center, Southeast University, Nanjing 210096, China.
authors.forename: Mingyue
authors.initials: M
authors.lastname: Li
authors.affiliation: Advanced Photonics Center, Southeast University, Nanjing 210096, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Chen
authors.affiliation: Advanced Photonics Center, Southeast University, Nanjing 210096, China.
authors.forename: Xueqin
authors.initials: X
authors.lastname: Ma
authors.affiliation: Advanced Photonics Center, Southeast University, Nanjing 210096, China. Electronic address: cyp@seu.edu.cn.
authors.forename: Yiping
authors.initials: Y
authors.lastname: Cui
mesh_terms: D015374:Biosensing Techniques; D045744:Cell Line, Tumor; D005456:Fluorescent Dyes / Q000737:chemistry; D006801:Humans; D008280:Magnetics; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon; D055095:Optics and Photonics; D045663:Quantum Dots; D055672:Static Electricity
chemical_list: D005456:Fluorescent Dyes; D037742:Nanotubes, Carbon
keywords: Carbon nanotubes; Cell imaging; Fluorescence; Magnetic field; Optical encoding; Surface enhanced Raman scattering