The synthesis of zirconium oxide (ZrO2) nanoparticles (NPs) in 1-butyl-3-methylimidazolium trifluoroacetate (BMIMCF3COO) for an amperometry phenol biosensor by Tapak, Nurul Syafiqah, Nawawi, Mohd Azizi, Tan, Eddie Ti Tjih, Mohd, Yusairie, Ab Rashid, Ahmad Hazri, Abdullah, Jaafar, Yusof, Nor Azah, Ahmad, Nor Monica