Journal of Nanomaterials & Molecular NanotechnologyISSN: 2324-8777

All submissions of the EM system will be redirected to Online Manuscript Submission System. Authors are requested to submit articles directly to Online Manuscript Submission System of respective journal.

Clinical Image, J Nanomater Mol Nanotechnol Vol: 9 Issue: 3

Colour Changes Associated with the Synthesis of Copper Oxide Nanoparticles

Reetika Malhotra*

Department of Chemistry, YMCA University of Science and Technology, Faridabad, India

*Corresponding Author : Reetika Malhotra
Department of Chemistry, YMCA University of Science and Technology, Faridabad, India,

Received: July 11, 2020 Accepted: July 20, 2020 Published: July 31, 2020

Citation: Malhotra R (2020) Colour Changes Associated with the Synthesis of Copper Oxide Nanoparticles. J Nanomater Mol Nanotechnol 9:3. doi: 10.4172/ jnmn.2020.9(3).279


Copper nanoparticles have a high tendency for oxidation. They are extremely sensitive to air, and the oxide phases are thermodynamically more stable. Thus, in order to minimize the oxidation and to control the growth of crystals, copper nanoparticles are usually protected with a capping agent. In these images, the copper nanoparticles were synthesized by chemical reduction process using copper (II) sulfate pentahydrate as precursor salt and starch as capping agent. The preparation method started with addition of 0.1 M copper (II) sulfate pentahydrate solution into 120 ml of starch (1.2%) solution with vigorous stirring for 30 minutes. In the second step, 50 ml of 0.2 M ascorbic acid solution was added to synthesize solution under continuous rapid stirring. Subsequently, 30 ml of 1 M sodium hydroxide solution was slowly added to the prepared solution with constant stirring and heating at 80°C for two hours.

Keywords: Nanoparticles; Oxidation; Capping agent


Figure 1: Change in colour during the synthesis of copper oxide nanoparticles: A) Shows the initial colour change of solution; B) and C) With further addition of sodium hydroxide into this solution with continuous stirring, colour of solution changes with some cloudy appearance indicating the initial stage of formation of nanoparticles; D) The final colour of the solution turned yellow to ocher. After the completion of reaction, the solution was taken off from heat and allowed to settle overnight and the supernatant solution was then discarded cautiously. Ocher colour precipitates obtained were dried at room temperature. After drying, nanoparticles were stored in glass vial for further analysis

international publisher, scitechnol, subscription journals, subscription, international, publisher, science

Track Your Manuscript

Awards Nomination

Recommended Conferences

31st International Conference on Nanomedicine and Nanomaterials

Prague, Czech Republic