Different wetting behavior of alkyl- and fluorocarbon-terminated films based on cupric hydroxide nanorod quasi-arrays

Nanorods of cupric hydroxide (Cu(OH)2) crystals with a diameter of about 100–500 nm and lengthof about tens of micrometers were directly fabricated on copper foils by alkali assistant surfaceoxidation technique. It was found that chemical modification with stearic acid (STA) or 1H,1H,2H,2Hperfluorodecyltriethoxysilane (PDES) led to significant increase in the contact angles of the Cu(OH)nanorod quasi-array film, which could be related to the chemicalmodification and the roughened structure of thefilmsurfaces. ComparedwithSTA-modified surface, PDES-modified surfacehad a lower contacangle hysteresis (CAH) and adhesion forwater droplets, possibly due to lower surface free energy of PDES than STA.