title: Gold Triangular Nanoprisms and Nanodecahedra: Synthesis and Interaction Studies with Luminol toward Biosensor Applications.
abstract: Gold triangular nanoprisms and nanodecahedra (pentagonal bipyramids) were synthesized in the absence and presence of nanoseeds by a simple solvothermal synthesis through the reduction of Auric Chloride (HAuCl4) with poly(vinylpyrrolidone) (PVP) in N,N-dimethylformamide (DMF), respectively. These gold nanoparticles exhibit two plasmon resonance bands. The interaction of these gold nanoparticles with luminol was investigated using UV-vis and fluorescence spectroscopy since hefty number of environmental and biological sensors are based on the combination of luminol and gold nanoparticles. The gold nanoparticles quenches the fluorescence of luminol through a static quenching mechanism, i.e., ground state complex formation, which was confirmed by both absorption spectroscopy as well as time-resolved fluorescence spectroscopy. The Stern-Volmer quenching constant and the effective quenching constant determine that gold nanodecahedra has more interaction with luminol than that of triangular gold nanoprisms. The distance between the gold nanoparticles and luminol, calculated using FRET theory, is less than 8 nm, which indicates efficient energy transfer during interaction. These results are expected to be useful for the development of novel sensors.
authors: Nanomaterials & Solar Energy Conversion Lab, Department of Chemistry, National Institute of Technology , Tiruchirappalli 620015, India.|Advanced Ceramics and Nanotechnology Laboratory, Department of Materials Engineering, University of Concepcion , Concepcion, Chile.
authors: Selvaraj
authors: S
authors: Naveenraj
authors: Advanced Ceramics and Nanotechnology Laboratory, Department of Materials Engineering, University of Concepcion , Concepcion, Chile.
authors: Ramalinga Viswanathan
authors: RV
authors: Mangalaraja
authors: Department of Environmental Engineering and Science, Feng Chia University , Taichung 407, Taiwan.
authors: Jerry J
authors: JJ
authors: Wu
authors: The Center of Excellence for Advanced Materials Research, King Abdulaziz University , P.O. Box 80203, Jeddah 21413, Saudi Arabia.
authors: Abdullah M
authors: AM
authors: Asiri
authors: Nanomaterials & Solar Energy Conversion Lab, Department of Chemistry, National Institute of Technology , Tiruchirappalli 620015, India.
authors: Sambandam
authors: S
authors: Anandan
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D002712:Chlorides; D031541:Fluorescence Resonance Energy Transfer; D006046:Gold / Q000737:chemistry*; D017612:Gold Compounds; D008165:Luminol / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D046529:Microscopy, Electron, Transmission; D036103:Nanotechnology; D013050:Spectrometry, Fluorescence; D020349:Surface Plasmon Resonance
chemical_list: D002712:Chlorides; D017612:Gold Compounds; D008165:Luminol; D006046:Gold; C024568:gold tetrachloride, acid