SADHU SUBHA (IN)
| AMENDED CLAIMS received by the International Bureau on 03 August 2016 (03.08.2016) WE Claim: 1. A novel composite of graphene quantum dot and silica in the weight ratio gqd and silica is in the range of 1 - 5: 1 -2and depend upon source of paper. 2. The composite as claimed in claim 1, wherein said composite is obtained from paper, wood pulp, leaves, bananas, coconut peel, coal or cotton. 3. The composite as claimed in claim 1 , wherein said gqd is luminescent and size is in the range of 4-6 nm; 4. The composite as claimed in claim 1, wherein size of said silica is in the range of 40- 50 nm. 5. The composite as claimed in claim 1, wherein the main chemical component of said paper is silicate of magnesia wherein the amount of silica is 62 -70%. 6. A novel one step process for the synthesis of said composite of gqd and silica as claimed in claim 1 comprising the steps of: a) burning the paper to afford ash; b) Suspending the ash of step (a) in water by sonicating and adding oxidizing agent followed by heating in a microwave for 2-4 minutes and repeating the microwave heating for six to seven times at 750 watts to afford a black residue of GQDs silica composite, with green fluorescence. 7. The process as claimed in claim 6, wherein said oxidizing agent is selected from glycolic acid, citric acid or ascorbic acid. 8. The process as claimed in claim 6, wherein said paper is silicate of magnesia wherein the amount of silica is 62 -70%. 9. The process as claimed in claim 6, wherein said water is de- ionised water. |