The applications of copper oxide nanoparticles are

1--Doping materials in semiconductors

2- chemical sensors

3- Effecient antimicrobacterial agent

4- Biological a pplications

5- A geood catalyst for different cross coupling reactions

CuO nanoparticles were found to be a good catalysts for various cross coupling reactions. e.g. http://onlinelibrary.wiley.com/doi/10.1002/adsc.201300416/abstract

You can try some other reaction also

For two possible biological applications, see the links below.

https://en.wikipedia.org/wiki/Antimicrobial_properties_of_copper

https://en.wikipedia.org/wiki/Copper_alloys_in_aquaculture

I have utilized copper oxide nanoparticles as an efficient antimicrobial agent. Please see the following

http://pubs.rsc.org/en/content/articlelanding/2013/ra/c3ra42209g#!divAbstract

In addition to above-mentioned applications, they shoud be useful for chemical sensing (http://journal.chemistrycentral.com/content/5/1/75) and biomedical http://www.plosone.org/article/info:doi/10.1371/journal.pone.0043442) applications.

I suggest going to www.espacenet.com database and entering "copper oxide nanoparticle" search. Since it is an international patent database (more than 84 countries) you will be given a picture what kind of patents used and for what purpose it. You will be able to find useful and unexpected areas as well.

Can be used as catalyst, biological application, doping material in semiconductors.

The applications of copper oxide nanoparticles are

1--Doping materials in semiconductors

2- chemical sensors

3- Effecient antimicrobacterial agent

4- Biological a pplications

5- A geood catalyst for different cross coupling reactions

1-As burning rate catalyst in rocket propellant. It can greatly improve the homogeneous propellant burning rate, lower pressure index, and also perform better as a catalyst for the AP composite propellant.

2- Can be applied to the catalyst, superconducting materials, thermoelectric materials, sensing materials, glass, ceramics and other fields As ceramic resistors, magnetic storage media, gas sensors, near-infrared tilters, photoconductive and photothermal applications.

3- As semiconductors, solar energy transformation, and high-tech superconductors.

As others have already mentioned above, it can be used in Energy storage. The following article explains more about it.

http://link.springer.com/article/10.1007%2Fs00231-011-0945-y

our research group have synthesized CuO nanoparticles and carried out some surface adsorption of organic dyes. good results have been obtained. you can try it too.

Good luck.

Dear colleagues,

Its my pleasure to thank you all for your valuable suggestions. our nanoparticles should be used in particular application because it is expensive. I would prefer for biomedical and sensing materials. I will look for the possible application. Good day.

CuO is an excellent catalyst for C-S cross-coupling.

"Transition-Metal-Catalyzed C-S, C-Se, and C-Te Bond Formation via Cross-Coupling and Atom-Economic Addition Reactions",

Chem. Rev., 2011, 111, 1596

http://dx.doi.org/10.1021/cr100347k

  Heterogeneous Fenton-type catalysts consist of an inert porous basis material like aluminum oxide (Fe-03) activated carbon (DELTA catalyst) with nickel, copper and iron is used in pharamceutical waste water degradation

Ideal for heat transfer applications if suspended in traditional working fluids such as water.