Development of inexpensive device for methanol detection in hand sanitizer gel using manganese-doped zinc sulfide quantum dots modified by N-methylpolypyrrole

Sophanat  KHENTHAPHAK; Pakorn  JULEANG; Wanida  WONSAWAT; Orawon  CHAILAPAKUL; Eakkasit  PUNRAT

doi:10.55713/jmmm.v33i1.1597

Authors

Sophanat KHENTHAPHAK Electrochemistry and Optical Spectroscopy Center of Excellence, Department of Chemistry, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
Pakorn JULEANG Electronics Technology Department, Faculty of Science, Ramkhamhaeng University, Bang Kapi, Bangkok 10240, Thailand
Wanida WONSAWAT Department of Chemistry, Faculty of Science and Technology, Suan Sunandha Rajabhat University, U-Thong Nok Road, Bangkok 10300, Thailand
Orawon CHAILAPAKUL Electrochemistry and Optical Spectroscopy Center of Excellence, Department of Chemistry, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
Eakkasit PUNRAT Department of Chemistry, Faculty of Science, Ramkhamhaeng University, Bang Kapi, Bangkok 10240, Thailand

DOI:

https://doi.org/10.55713/jmmm.v33i1.1597

Keywords:

Methanol detection, Manganese-doped zinc sulfide quantum dots, N-methyl polypyrrole, Digital-image colorimetry, Hand sanitizer gel

Abstract

A method for methanol detection by an inexpensive device using a nanomaterial modified by N-methylpolypyrrole (NMPPY) has been developed. Manganese-doped zinc sulfide quantum dots (Mn/ZnS-QDs) were synthesized and then characterized by a fluorescence spectrophotometer to study their spectroscopic properties. Mn/ZnS-QDs were modified with NMPPy and studied by digital-image colorimetry to optimize conditions for methanol detection. A 2 mL of 3000 mg∙L^–1 Mn/ZnS-QDs modified with 300 μL of 1000 mg∙L^-1 of NMPPy was chosen to be a detecting reagent for methanol determination. Under the optimum conditions, the linear range was found to be 2%v/v to 50%v/v of methanol with R-square of 0.9434 and the sensitivity of 3.569 ´ 10^–3(%v/v)^-1, whilst the limit of detection (LOD) was 19.5%v/v. The selectivity of this method was also studied with several solvents; it was proven selective for methanol. Furthermore, a prototype device with simple and inexpensive has been created. The analytical performances were studied; the linearity of methanol detection was found in the range of 20%v/v to 80%v/v with R-square of 0.9918 and the sensitivity of 3.38 ´ 10^-3 (%v/v)^-1. Finally, the newly developed device was applied to analyze samples of hand sanitizer gel by digital-image colorimetry with acceptable results.

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