氧化石墨烯水热还原前后的发光光谱

Photoluminescence of Graphene Oxide and Hydrothermally Reduced Graphene Oxide

分别采用改进Hummers方法和水热还原法制备了氧化石墨烯（GO）和还原氧化石墨烯（RGO）。GO和RGO经透射电子显微镜（TEM）、紫外-可见吸收光谱（UV-Vis）、红外光谱（IR）、荧光发射和激发光谱（PL、PLE）等技术手段进行了表征。荧光发射光谱显示,氧化石墨烯（GO）在可见光的激发下可以得到波长在600-800 nm范围内的宽谱近红外荧光。通过比较氧化石墨烯水热还原前后的光谱变化,发现氧化石墨烯近红外荧光起源于氧化石墨烯的表面含氧基团,如CO、COOH。近红外荧光穿透性好、对生物组织损坏小,非常适合于生物成像,预示着氧化石墨烯在生物成像方面的应用潜力。

Graphene oxide （GO） and reduced graphene oxide （RGO） were prepared by modified Hummers method and hydrothermal reduction, respectively. They were characterized by transmission electron microscopy （ TEM）, UV-Vis absorption spectroscopy （ UV-Vis ）, Fourier transform infrared （FTIR） spectroscopy, and photoluminescence emission and excitation spectroscopy（ PL, PLE）. PL spectra indicate that the broad near- infrared（NIR） photoluminescence ranging from 600 to 800 nm can be acquired from graphene oxide under excitation of visible light. By comparing PL spectra from GO with that from RGO, and through the analysis of their UV-Vis absorption and FTIR spectra, the oxygen related groups, such as C=O and COOH, are found to be responsible for the NIR PL from GO. NIR fluorescence is favorable for bio-imaging because of its excellent penetrating ability and little applications in bio-imaging. damage to tissues. This indictates that GO has great potential