Solvatokromna bojila u kemijskim optičkim senzorima: mehanizam detekcije

undergraduate thesis

• Title (english): Solvatochromic dyes in optical chemical sensors: mechanism of detection
• Author: Iva Gudan Pavlović
• Mentor: Ivana Steinberg (mentor)
• Committee member: Ivana Steinberg (predsjednik povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Committee member: Ljerka Kratofil Krehula (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-09-11, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Tema rada je primjena solvatokromnih bojila u kemijskim optičkim senzorima s naglaskom na mehanizme detekcije. Ion-selektivni optički senzori sa solvatokromnim bojilima kao pretvorničkim elementima predstavljaju unapređenje klasičnih ion-selektivnih optoda s H+ kromoionoforima. Primjena solvatokromnih bojila omogućuje izradu pH neosjetljivih ion-selektivnih optičkih senzora. U radu su opisani mehanizmi detekcije ion-selektivnih optičkih senzora sa solvatokromnim bojilima. Izložen je pregled literature vezan uz trendove razvoja senzora. Eksperimentalno je izrađen i ispitan senzor sa solvatokromnim bojilom
3,3'-diheksadeciloksakarbocijanin perklorat (DiOC16(3)) na papiru kao supstratu osjetljiv na ione kalija. Potvrđena je neosjetljivost na promjenu pH u rasponu 1-10, određena je kalibracijska krivulja, područje osjetljivosti i vrijeme odziva optode. Senzor omogućava određivanje koncentracije kalija u intervalu od 3,16∙10^-2 M do 1 M u nepuferiranim otopinama te pokazuje dobru reverzibilnost. Vrijeme odziva optode kraće je od 3 minute.

Abstract (english)

The topic of the thesis is application of solvatochromic dyes in chemical optical sensors, with emphasis on detection mechanisms. Ion-selective optical sensors based on solvatochromic dyes can be viewed as upgrades of conventional ion-selective optical sensors that are based on H+ chromoionophores. The application of solvatochromic dyes leads to sensor pH insensitivity. Detection mechanisms of ion-selective optical sensors with solvatochromic dyes are described in work. A literature review related to sensor development trends is presented in the thesis. A potassium sensitive sensor with solvatochromic dye
3,3'-dihexadecyloxacarbocyanine perchlorate (DiOC16(3)) was fabricated on a paper substrate and experimentally tested. Insensitivity to pH in the interval 1-10 was confirmed. Calibration curve, sensitivity range and sensor response time were determined. The sensor allows the determination of potassium concentrations in the range from 3.16∙10^-2 M to 1 M in non-buffered solutions and shows good reversibility. The sensor response time is less than 3 minutes.

• Keywords: ion-selektivni optički senzori; solvatokromna bojila; detekcija kalija; mehanizmi detekcije; senzor na papiru
• Keywords (english): ion-selective optical sensors; solvatochromic dyes; potassium detection; detection mechanisms; paper-based sensor
• Language: croatian
• URN:NBN: urn:nbn:hr:149:656933
• Study programme: Title: Materials Science and Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2023-05-10 09:02:49