Please check...

Dhillon GS, Kaur S, Brar SK. (2014). Facile fabrication and characterization of chitosan-based zinc oxide nanoparticles and evaluation of their antimicrobial and anti-biofilm activity. International Nano Letters, 4, 107.

Laser ablation in liquids may be an interesting possibility. Have a look to the article:

E. Fazio et al., Applied Surface Science 272 (2013) 30– 35

Thank you all.

I want more reference and methods.

Hi, please refer following review:

1. Nanotechnology 14 (2003) 11–15

2. doi:10.1016/S0025-5408(96)00175-4

3. Materials 2014, 7, 2833-2881; doi:10.3390/ma7042833

With Best Regards,

Numerous methods have been developed for the synthesis of ZnO nanostructures, e.g. vapour-liquid-solid (VLS) growth with the use of a catalyst [4], pulsed laser deposition [5], electrochemical deposition in porous membranes [6], metal vapour transport using Zn sources [7], physical vapour transport using ZnO and graphite powders [8], chemical vapour deposition using zinc acetylacetonate hydrate [9], metal organic chemical vapour deposition using diethylzinc and O2/N2O as precursors [10] and the hydrothermal growth approach [11].

[4]     H. Huang, S. Mao, H. Feick, H. Yan, Y. Wu, H. Kind, N. Tran, E. Weber, R. Ruso, P. Yang, Room-temperature ultraviolet nanowire nanolasers, Science 292 (2001) 1897-1899, http://dx.doi.org/10.1126/science.1060367.

[5]     J.H. Choi, H. Tabata, T. Kawai, Initial preferred growth in zinc oxide thin films on Si and amorphous substrates by a pulsed laser deposition, J. Cryst. Growth 226 (2001) 493-500, http://dx.doi.org/10.1016/S0022-0248(01)01388-4.

[6]     C. Liu, J.A. Zapien, Y. Yao, X. Meng, C.S. Lee, S. Fan, Y. Lifshitz, S.T. Lee, High-density, ordered ultraviolet light-emitting ZnO nanowire arrays, Adv. Mater. 15 (2003) 838-841, http://dx.doi.org/10.1002/adma.200304430.

[7]     S.C. Lyu, Y. Zhang, H. Ruh, H.J. Lee, H.W. Shim, E.K. Suh, C.J. Lee, Low temperature growth and photoluminescence of well-aligned zinc oxide nanowires, Chem. Phys. Lett. 363 (2002) 134-138, http://dx.doi.org/10.1016/S0009-2614(02)01145-4.

[8]        B.D. Yao, Y.F. Chen, N. Wang, Formation of ZnO nanostructures by a simple way of thermal evaporation, Appl. Phys. Lett. 81 (2002) 757-759, http://dx.doi.org/10.1063/1.1495878.

[9]     J. Wu, S. Liu, Catalyst-free growth and characterization of ZnO nanorods, J. Phys. Chem. B 106 (2002) 9546-9551, http://dx.doi.org/10.1021/jp025969j.

[10]   S.W. Kim, Sz. Fujita, Sg. Fujita, Self-organized ZnO quantum dots on SiO2/Si substrates by metalorganic chemical vapour deposition, Appl. Phys. Lett. 81 (2003) 5036-5038, http://dx.doi.org/10.1063/1.1527690.

[11]   L. Vayssiers, K. Keis, S. Lindquist, A. Hagfeldt, Purpose-built anisotropic metal oxide material: 3D highly oriented microrod array of ZnO, J. Phys. Chem. B 105 (2001) 3350-3352, http://dx.doi.org/10.1021/jp010026s.

In relation to your question I regret do not answer. I usually work in the topics related with X-ray crystallography.  Perhaps may be able inform you, about chemical synthesis, the chemist in many of my last publications. He is on ResearchGate list. His e-mail is [email protected]

ZnO is the most versatile nano-particle...  can be synthesized in a variety of shapes.. This review and references within will be a good start

doi:10.3390/ma7042833

there are many method for synthesis of ZnO nanoprticles, you have to choose based on availability of your instrumnetal facility, chemicals and based on your size expectation....

You can prepare ZnO NPs by co-precipitation method simply by reacting Zinc Nitrate with sodium hydroxide (NaOH) or potassium hydroxide (HOH) under alkaline conditions.

Is there any precise method known to control the bandgap of the synthesized metal oxide nanoparticles ?

Mohamed Abd El-Kodous Rajesh Jagannath Tayade Sridhar Vadahanambi José M. Amigó Deon Neveling Gunjan Purohit Garry Dhillon

Thank you all for deep insights towards ZnO nanoparticle synthesis. Your contributions are highly appreciated.

May I ask, is there anyone working on or know about precise method known to control the bandgap of the synthesized metal oxide nanoparticles ?

Omkar Singh Kushwaha I think If you could control particle size, you can control band gap (inverse relation).

Omkar S. Kushwaha , No presently not working in this area...

Dear RG Members,

Please follow the updates about the Nobel Prizes on this link:

https://www.researchgate.net/project/The-Nobel-Prize-2

Don't forget to give your feedback/recommendations. Excuse me for repeated request.

Regards, OSK

Here is the DOI for the article on ZnO nanoparticles done by our group few years back

DOI 10.1186/s13065-016-0162-3