Abubaker M.Che Wan Zanariah Che Wan NgahAhmad M.Kuswandi B.2024-05-282024-05-28201897807400000000094243X10.1063/1.50412332-s2.0-85048899768WOS:000436350900015https://www.scopus.com/inward/record.uri?eid=2-s2.0-85048899768&doi=10.1063%2f1.5041233&partnerID=40&md5=ad92adaaa39292894ce0952466e051c8https://oarep.usim.edu.my/handle/123456789/8669A sensitive and selective colorimetric method has been developed for detection of Al3+ ion using 4-benzoyl pyrazolone-functionalized gold nanoparticles (BMPBP-AuNPs) as novel colorimetric probes. The BMPBP-AuNPs were characterized by UV-visible spectrometry and transmission electron microscopy (TEM). It was found that the addition of the Al3+ ions led to a rapid aggregation of the BMPBP-AuNPs, which changed the color of the mixture from red to blue. Furthermore, there was a shift in the characteristic surface plasmon resonance (SPR) peak from 524 to 650 nm of BMPBP-AuNPs, which confirmed that a good linear relation (R2 = 0.9935) was present between the absorption ratio of 524 and 650 nm. Also, the assay detected the Al3+ ion concentrations in the linear range 0-12 ppm with the detection limit is 0.05 ppm. Finally, the synthesized BMPBP-AuNPs were successfully used as a colorimetric sensor for the selective and sensitive detection of the Al3+ ions in water samples.en-USConference Paper1972