The cover photo describes the ring topological structure of carbon nucleus (using vortex-fractal-ring theory), which consists from two globules with 3 protons globule substructures. As discussed by, this vortex-fractal-ring theory is a new and original view of elementary particles and the structure of atomic nuclei, atoms, and molecules. Its basics are simple for understanding through the comprehensive topological structure that does not need description by complicated mathematical formulas. This theory together with grammatical evolution can design new models of nanostructures and allows us to understand the fundamental physical and chemical reasons for the stability and reactivity of atoms and molecules.
Novel synthesis of Pd nanosheets used as highly sensitive SERS substrate for trace fluorescent dye detection
Tran Thi Bich Quyen1*, Doan Van Hong Thien1, Bui Le Anh Tuan2
1Department of Chemical Engineering, College of Technology, Can Tho University, 3/2 Street, Ninh Kieu District, Can Tho City 900000, Vietnam
2Department of Civil Engineering, Can Tho University, 3/2 Street, Ninh Kieu District, Can Tho City 900000, Vietnam
Adv. Mater. Lett., 2019, 10 (4), pp 279-283
Publication Date (Web): Jan 10, 2019
Copyright © 2018 VBRI Press
In this work, a simple and effective method has been developed to synthesize Pd nanosheets that were successfully employed by reducing the Pd salt precursor in N, N-dimethylformamide (DMF), cetyltrimethylammonium bromide (CTAB) and lemon extract in the presence of Tungsten hexacarbonyl with different reaction conditions (e.g., temperature, reaction time). It indicates to be an eco-friendly, simple and novel method for the synthesis, providing a cost-effective and efficient route for the Pd nanosheets’ synthesis. The Pd nanosheets were characterized by UV-vis spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD). It was also demonstrated that the Pd nanosheets were both highly SERS-active and stable. Results show that Rhodamine 6G (R6G), used as a fluorescent marker, could be detected over a wide concentration range from 10−13 to 10−8 M, with the lower limit of detection being 10−13 M.
Pd nanosheets (Pd NSs), environmental friendly, lemon extract, Surface-Enhanced Raman Scattering (SERS), rhodamine 6G (R6G).