In this work nickel octadecylphthalocyanine (NiPc(C 10 H 21 ) 8 ) and cadmium telluride quantum dots (QDs) capped with thioglycolic acid (TGA) are adsorbed on single walled carbon nanotubes (SWCNT) to form NiPc(C 10 H 21 ) 8 -SWCNT-QDs conjugate. X-ray photoelectron, ultra violet/visible and Raman spectroscopies are used to characterize the conjugate. SWCNT, poly- Ni(O)Pc(C 10 H 21 ) 8 , NiPc(C 10 H 21 ) 8 -SWCNT and NiPc(C 10 H 21 ) 8 -SWCNT-QDs complexes are used to modify glassy carbon electrode (GCE) and used for the electro-oxidation of pentachlorophenol as a test molecule. NiPc(C 10 H 21 ) 8 -SWCNT-QDs electrode gave the best detection current for pentachlorophenol.