Lasers in Eng., Vol. 36, pp. 63–72 Reprints available directly from the publisher Photocopying permitted by license only 63 ©2017 Old City Publishing, Inc. Published by license under the OCP Science imprint, a member of the Old City Publishing Group *Corresponding author: Tel: +353 1 700 7603; E-mail: komal.bagga@dcu.ie Carbon Nanoparticle Functionalization of Laser Textured Polymer Surfaces for Chemical and Biological Speciation R. MCCANN 1,2,3,4 , K. BAGGA 1,2,3 *, E. MCCARTHY 1,2,3,4 , R. GROARKE 1,2,3 , A. AL-HAMAOY 1,2,5 , A. STALCUP 3,6 , M.VÁZQUEZ 1,3,6 AND D. BRABAZON 1,2,3,4 1 Advanced Processing Technology Research Centre, Dublin City University, Glasnevin, Dublin 9, Ireland 2 School of Mechanical and Manufacturing Engineering, Dublin City University, Glasnevin, Dublin 9, Ireland 3 Irish Separation Science Cluster, National Centre for Sensor Research, Dublin City University, Glasnevin, Dublin 9, Ireland 4 National Centre for Plasma Science and Technology, Dublin City University, Glasnevin, Dublin 9, Ireland 5 Mechanical Engineering Department, College of Engineering, Al-Nahrain University, Baghdad, Iraq 6 School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland A novel method for the fabrication of microchannels on cyclic olefin polymer (COP) films is presented. COPs are increasingly popular choices as substrate materials as a result of their promising properties, such as good optical transparency in the near ultraviolet (UV) range, high chemi- cal resistance and low water absorption. This paper presents fabrication of microchannels on cyclic olefin polymer using a 1064 nm Nd:YAG laser. The effect of different plasma treatments on hydrophilicity of the substrate was also investigated and contact angle measurements were performed. The shape and morphology of the micro-channels formed were examined using a scanning electron microscope (SEM). In order to functionalize the resulting micro-channels with ultrapure carbon nano- structures for chemical and biological speciation, different forms of car- bon nanostructures were prepared from graphite by pulsed laser ablation in liquid (PLAL). Keywords: Nd:YAG laser, cyclic olefin polymer (COP), ZeonorFilm, carbon nanoparticles (CNPs), micromachining, pulsed laser ablation, liquid, contact angle