title: Novel Conjugated Polymers: Synthesis and  Application as Sensor Arrays for Detection and  Discrimination of Nitroaromatics
creator: Huang, Wei
subject: ddc-500
subject: 500 Natural sciences and mathematics
subject: ddc-540
subject: 540 Chemistry and allied sciences
description: This thesis evaluates three novel synthesized conjugated polymer series with respect to their  sensitivity and selectivity in the detection of nitroaromatic analytes, especially in aqueous  environments.  Central building blocks of the polymers are functionalized truxene or tetraphenylethene  centers, which are polycondensed with different diethinylaromatics by Sonogashira cross-  coupling.  In a first explorative study, Truxene-based hyper-branched polymers (HCPs) were compared  with related linear rod-shaped poly(p-phenylenethynylenes) (PPEs) with respect to their  sensor performance of nitroaromatics (Chapter 2). By encapsulation with amphiphilic F-127  in water-soluble micelles, 14 nitroaromatics could be distinguished with 100% accuracy in  fluorescence quenching experiments. The HCPs display a better sensor performance than the  sensor system for nitroaromatics previously known from PPE (Chapter 2). To increase the  sensor performance, tetraphenylethene cores (TPEs) replaced the truxene units in the  polymers in a follow-up study (Chapter 3). TPEs use aggregate-induced emission to detect  the analytes. A sensor field based on four TPE polymers was able to detect and distinguish  nitroaromatics in water with excellent sensitivity (ppm range) compared to HCP or PPE  systems (Chapter 3). This improved system is able to detect the regioisomers of  nitroaromatics in a specific way. Finally, the performance of the TPE system was improved  by varying the TPE moiety with amino or nitro groups for aqueous detection (Chapter 4). The  functional TPE polymers (F-TPEPs) also exhibit aggregate-induced emission, with enhanced  pH-specific (amino groups) or solvatochrome (nitro groups) sensor sensitivity. The presence  of amino groups improves the sensory properties of F-TPEPs in the aqueous nitroaromatic  system. The challenge of the detection of nitroaromatics in water could be mastered by the  systematic development of F-TPEPs sensor system from the well-known PPE sensor.
date: 2019
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/26604/1/Dissertation%20of%20Wei%20Huang.pdf
identifier: DOI:10.11588/heidok.00026604
identifier: urn:nbn:de:bsz:16-heidok-266043
identifier:   Huang, Wei  (2019) Novel Conjugated Polymers: Synthesis and Application as Sensor Arrays for Detection and Discrimination of Nitroaromatics.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/26604/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng