Evaluation of the Photothermal Properties of a Reduced Graphene Oxide/Arginine Nanostructure for Near-Infrared Absorption.
Mohadeseh HashemiMeisam OmidiBharadwaj MuralidharanHugh D C SmythMohammad A MohagheghiJavad MohammadiThomas E MilnerPublished in: ACS applied materials & interfaces (2017)
Strong near-infrared (NIR) absorption of reduced graphene oxide (rGO) make this material a candidate for photothermal therapy. The use of rGO has been limited by low stability in aqueous media due to the lack of surface hydrophilic groups. We report synthesis of a novel form of reduced graphene-arginine (rGO-Arg) as a nanoprobe. Introduction of Arg to the surface of rGO not only increases the stability in aqueous solutions but also increases cancer cell uptake. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) images are recorded to characterize the morphology of rGO-Arg. Fourier transform infrared (FTIR), X-ray photoelectron spectra (XPS), Raman, and UV-vis spectroscopy are utilized to analyze the physiochemical properties of rGO-Arg. Interaction of rGO-Arg with 808 nm laser light has been evaluated by measuring the absorption cross section in response to periodically modulated intensity to minimize artifacts arising from lateral thermal diffusion with a material scattering matched to a low scattering optical standard. Cell toxicity and cellular uptake by MD-MB-231 cell lines provide supporting data for the potential application of rGO-Arg for photothermal therapy. Absorption cross-section results suggest rGO-Arg is an excellent NIR absorber that is 3.2 times stronger in comparison to GO.
Keyphrases
- reduced graphene oxide
- gold nanoparticles
- atomic force microscopy
- high speed
- photodynamic therapy
- high resolution
- electron microscopy
- single molecule
- oxidative stress
- nitric oxide
- drug release
- computed tomography
- optical coherence tomography
- machine learning
- minimally invasive
- stem cells
- magnetic resonance
- high intensity
- electronic health record
- convolutional neural network
- density functional theory
- bone marrow
- room temperature
- monte carlo