<p>The performance of four Nano-structured Surfaces by Composite Nano-particle Coating (NSCNC) and a bare Cu surface in boiling heat transfer is examined in the study. The two step chemical method used to create the NSCNC surfaces. Cu-Al₂O₃ composite nanoparticles are then coated over this CuO thin films surface using electrochemical deposition to create NSCNC surface. First, a thin CuO layer was created over bare Cu surface by chemical etching. Porosity, roughness, wettability, particle composition, and other characteristics that have a dominant influence on boiling heat transfer are examined for the NSCNC surfaces. According to the results of a pool boiling experiment done with distilled water, the produced NSCNC surfaces’ boiling curves tend to be similar to those of bare Cu surfaces, but their onset nucleate boiling (ONB) rates are substantially lower. The Critical Heat Flux (CHF) and Boiling Heat Transfer Coefficient (BHTC) for the NSCNC surfaces rise by a maximum of 53% and 95%, respectively compared to bare Cu. The bubble characteristics at the time of boiling is noticed using a high-speed camera, and several factors such as nucleation site density, bubble departure diameter, and bubble departure frequency are statistically studied. NSCNC surfaces’ nucleation site density has increased, encouraging the creation of more tiny bubbles at a faster rate on the surface. All of these characteristics contribute to the NSCNC surface’s improved CHF and BHTC compared to the bare Cu surface.</p> Graphical abstract <p></p>