Primjena ugljikovih nanocjevčica u izradi ion-selektivnih elektroda bez unutarnjeg elektrolita

undergraduate thesis

• Title (english): Application of carbon nanotubes in the development of ion-selective electrodes without internal electrolyte
• Author: Željka Boček
• Mentor: Petar Kassal (mentor)
• Committee member: Petar Kassal (predsjednik povjerenstva)
• Committee member: Stjepan Milardović (član povjerenstva)
• Committee member: Helena Otmačić Ćurković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-09-02, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U ovom radu istražena je primjena ugljikovih nanocjevčica (CNT) u ulozi čvrstog kontakta u izradi ion-selektivnih elektroda bez unutarnjeg elektrolita. Ugljikove nanocjevčice dispergirane su u etanolu uz dodatak polivinil-butirala (PVB) za stabilizaciju otopine. Stabilnost disperzija okarakterizirana je UV-Vis spektrofotometrijom, a vodljivost je ispitana mjerenjem otpora tankih filmova pripremljenih rotacijskim oblaganjem. Ion-selektivne elektrode za detekciju amonija pripremljene su nakapavanjem različitih volumena najkoncentriranije otopine CNT/PVB na grafitnu disk elektrodu te otopljene ion selektivne membrane s nonaktinom kao ionoforom. Potenciometrijskim mjerenjima pronađen je optimalan omjer čvrstog kontakta i membrane koji daje rezultate usporedive s literaturnim vrijednostima.

Abstract (english)

In this work the application of carbon nanotubes (CNT) as solid contact in the development of ion-selective electrodes without internal electrolyte was studied. Carbon nanotubes were dispersed in ethanol with polyvinyl-butiral (PVB) added for stabilization. Dispersion stability was characterized by UV-Vis spectrophotometry, while the conductivity of thin films prepared by spin-coating was tested by measuring resistance by the four point probe method. Ion-selective electrodes for detection of ammonium ion were prepared by drop-casting variable amounts of the most concentrated CNT/PVB solution followed by the ion-selective membrane cocktail with nonactin as ionophore. Potentiometric measurements were conducted and the optimal ratio of solid contact vs. membrane was found, with results comparable with literature values.

• Keywords: čvrstofazna ion selektivna elektroda; potenciometrija; amonij; ugljikove nanocjevčice; kemijski senzori
• Keywords (english): solid state ion-selective electrode; potentiometry; ammonium ion; carbon nanotubes; chemical sensors
• Language: croatian
• URN:NBN: urn:nbn:hr:149:206230
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-03-23 13:49:11