title: C96H30tailored single-layer and single-crystalline graphene quantum dots.
abstract: By controllable synthesis of a carbon precursor and with a suitable preparation routine, a series of single-layer and single-crystalline graphene quantum dots (GQDs) with uniform size distribution were prepared from C96H30. It was found that the absorption, photoluminescence (PL) and two-photon photoluminescence (TPPL) show a high size-dependent effect with a redshift that occurs as the size grows. Two-photon absorption (TPA) properties of GQDs were measured at 800 nm under a femtosecond pulse laser. Two-photon bioimaging of HeLa cells was carried out to determine TPA properties. Most significantly, the as-prepared GQDs showed potential in a practical application in two-photon cell bioimaging due to their high contrast TPPL. In addition, the superior nonlinear absorption, stable TPPL and excellent solubility were beneficial to the optical limiting (OL) properties.
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing, 100190, China. zhengxie@mail.ipc.ac.cn zhou_shuyun@mail.ipc.ac.cn and University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing, 100049, China.
authors.forename: Biao
authors.initials: B
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing, 100190, China. zhengxie@mail.ipc.ac.cn zhou_shuyun@mail.ipc.ac.cn.
authors.forename: Xingming
authors.initials: X
authors.lastname: Sun
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing, 100190, China. zhengxie@mail.ipc.ac.cn zhou_shuyun@mail.ipc.ac.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Yan
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing, 100190, China. zhengxie@mail.ipc.ac.cn zhou_shuyun@mail.ipc.ac.cn.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Xie
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing, 100190, China. zhengxie@mail.ipc.ac.cn zhou_shuyun@mail.ipc.ac.cn.
authors.forename: Ping
authors.initials: P
authors.lastname: Chen
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing, 100190, China. zhengxie@mail.ipc.ac.cn zhou_shuyun@mail.ipc.ac.cn.
authors.forename: Shuyun
authors.initials: S
authors.lastname: Zhou