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Abstract
The number 10-9 is termed the word Nano, nanoparticles are particles made up of carbon, metal, metal oxides or organic matter and typically less than 100 nanometers in size. The nanoparticles are generally classified into the organic and inorganic nanoparticles, ceramics and carbon based nanoparticles with chemical variation base. The organic nanoparticles completely made of carbon are carbon-based nanoparticles and they can be classified into variant allotropic forms like fullerenes, graphene, carbon nanotubes, carbon nanofibers, carbon nano-dots and carbon black and sometimes activated carbon in nano scale size. Quantum dots are nanoscale made crystal having unique electronic and optical properties that is ability to transport electrons and emit light of various color, blue, yellow and orange, when illuminated by UV light source. Carbon based quantum dots are younger member of carbonaceous nanoparticle belong to broad family of carbon allotrope and generally called Carbon dots (CDs) are novel zero dimensional nanostructure (<10 nm in size) carbon based particles with lattice space of 0.24 and 0.34 nm accidentally developed in 2004 by Xu et al. Carbon dots are common name for variety of extremely tiny size carbon nanomaterial, graphene quantum dots and carbon quantum dots are two most common types of Carbon quantum dots. Because of their chemical, biological and pharmaceutical importance there has been considerable interest in developing numerous preparation approaches since their discovery. Literature survey report reveals that various plant resources such as orange, banana and banana peel, watermelon, Trapa bispinosa peel, coffee grounds, food waste, sugar cane juice, potato, ginger juice, orange waste peels, bread, sugar, and jiggery as natural carbon source and milk, hair, honey etc. as animals precursors are checked via several preparative techniques, arc discharge, laser ablation, and electrochemical oxidation, microwave mediated synthesis, thermal decomposition and hydrothermal method, to synthesize C-Dots. The specie, Viburnum grandiflorum, is folk medicinal plant which is used local1y to treat stomach and toothache, abdominal pain, malarial, diuretic, wound healing and whooping cough. It has also been evaluated as respiratory diseases, as anti-typhoid and analgesic, cytotoxic, as anti-diabetic, antioxidant and anti-bacterial, anti-cancer, as anti-nociceptive and as molluscicide agent due to having natural product. The selected species possess a lot of natural products. After the literature study a facile synthesis of fluorescence N/S Co-doped carbon dots was carried out from fruit of Viburnum grandiflorum using L-Cysteine as Sulphur source and ethylenediamine as Nitrogen source was performed through hydrothermal treatment and the synthesized N/S CDs was apply to check heavy metals detection in water, especially Fe3+ sensing activity. The C-dots functional groups were acquired with help of a FTIR (Perkin Elmer spectrometer). The absorption spectra of C-dots U – 300 spectrophotometer (Hitachi Japan) and fluorescence spectra (FL) were performed on (Shimadzu RF – 530l) fluorescence spectrofluorometer. The Bruker AXSD8 Advance X-ray diffractometer was used to record crystalline structure of synthesized C-dots and XPS tech was conducted on Quentera SXM (ULVAC-PH1 Japan) XPS. The morphology of C-dots was examined by the field emission scanning electron microscopy (H1TACHI H-8l00 Tokyo, Japan) and particle size was examined by TEM (JEOL-2l00+).