Jenner H. L. Ngai

ORCID: 0000-0002-8597-7915
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About
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Research Areas
  • Conducting polymers and applications
  • Organic Electronics and Photovoltaics
  • Perovskite Materials and Applications
  • Analytical Chemistry and Sensors
  • Thin-Film Transistor Technologies
  • Organic Light-Emitting Diodes Research
  • ZnO doping and properties
  • Synthesis and properties of polymers
  • Crystallization and Solubility Studies
  • Gas Sensing Nanomaterials and Sensors
  • X-ray Diffraction in Crystallography
  • Polyoxometalates: Synthesis and Applications
  • Dendrimers and Hyperbranched Polymers
  • Advanced Memory and Neural Computing
  • Advanced Battery Materials and Technologies
  • Advanced Sensor and Energy Harvesting Materials
  • Photoreceptor and optogenetics research
  • Advanced Polymer Synthesis and Characterization
  • Neuroscience and Neural Engineering
  • Transition Metal Oxide Nanomaterials
  • Block Copolymer Self-Assembly
  • Copper-based nanomaterials and applications
  • Carbon Nanotubes in Composites
  • Luminescence and Fluorescent Materials
  • Chalcogenide Semiconductor Thin Films

National Research Council Canada
2022-2025

University of Waterloo
2017-2024

Hong Kong Baptist University
2016-2020

Kowloon Hospital
2017-2020

Regional Municipality of Waterloo
2018-2019

Institute of Nanotechnology
2019

National Institute for Nanotechnology
2018

Mg<sup>2+</sup> cross-linked conductive polymer PEDOT:PSS is used as a cathode binder to improve the Li–S battery capacity and cycling stability.

10.1039/c8se00167g article EN Sustainable Energy & Fuels 2018-01-01

For organic memristors, non-zero-crossing current-voltage (I-V) curves are often observed, which can be attributed to capacitive effects. If the conversion between capacitance-dominated state (CDS) and memristance-dominated (MDS) realized in a controllable manner, more device functions obtained. In this work, two-terminal memristor using common dye, azobenzene (AZB), as active layer was prepared. It is found that applied voltage gradually increases, transition from CDS MDS. low range (<1 V),...

10.1021/acsami.2c12850 article EN ACS Applied Materials & Interfaces 2022-08-30

This study presents an innovative temperature sensor based on a thermistor nanocomposite of graphite (Gt) and polystyrene (PS). The exhibited notable thermal stability film integrity, offering two distinct linear response regions within the tested range −10 to 60 °C. It demonstrated sensitivity 0.125% °C–1 between 10 °C, followed by another with 0.41% from 20 Furthermore, it response/recovery time 0.97/1.3 min at heating/cooling rate °C min–1. maintained minimal baseline drift even when...

10.1021/acsomega.4c09548 article EN cc-by ACS Omega 2025-01-23

Abstract A series of donor‐acceptor polymers, namely PTEB , PMEB PEEB and PPEB are designed synthesized for temperature sensing. The polymers composed hemi‐isoindigo as the acceptor unit, 3,3″‐bis(dodecyloxy)‐2,2″‐bithiophene donor thiophene spacer unit. Carbamate solubilizing side chains used to increase solubility in a green solvent anisole. Furthermore, carbamate can be thermally removed form solvent‐resistant PTNB PMNB PENB PPNB respectively. removal also helps elevate highest occupied...

10.1002/adfm.202110995 article EN Advanced Functional Materials 2022-01-13

The study has developed two hemi-isoindigo (HID)-based polymers for printed flexible resistor-type nitrogen oxide (NO

10.1002/smtd.202301521 article EN cc-by Small Methods 2024-02-06

Most optimized, high performance, bulk‐heterojunction (BHJ) polymer solar cells have an active layer thickness of about 100 nm. The thin is unfavorable for optical absorption and film coating. This contribution employs a ternary cell to address this problem. In paper, thick BHJ can be fabricated that retain 90% power conversion efficiencies (PCEs) the optimized thin‐film cells. BHJs under investigations are PTB7:PC 71 BM, PTB7‐Th:PC P3HT:PCBM. Into these BHJs, component, p‐DTS(fbtth 2 )...

10.1002/aelm.201700007 article EN Advanced Electronic Materials 2017-03-17

Micron-size organolead perovskite crystals grown on insulating polymeric surfaces as gate dielectric materials for high performance thin film transistors.

10.1039/c7ra08699g article EN cc-by-nc RSC Advances 2017-01-01

A novel small bandgap donor–acceptor polymer with a very band gap of 0.95 eV shows promising photoresponse under near infrared light in phototransistors.

10.1039/c7tc03584e article EN Journal of Materials Chemistry C 2017-01-01

Abstract A novel donor–acceptor (D‐A) conjugated polymer, poly[bis(2‐ethylhexyl)3‐(3′′,4′‐bis(dodecyloxy)‐[2,2′:5′,2′′‐terthiophen]‐5‐yl)‐1,4‐dioxo‐6‐(thiophen‐2‐yl)pyrrolo[3,4‐ c ]pyrrole‐2,5(1 H ,4 )‐dicarboxylate] (PDEB), comprising an electron‐accepting carbamate side‐chain bearing thiophene‐flanked diketopyrrolopyrrole (DPPTh) and electron‐donating 3,3′‐bis(dodecyloxy)‐2,2′‐bithiophene (C12‐BTO) is synthesized. The side‐chains in this polymer can be thermally removed at a moderate...

10.1002/aelm.202000935 article EN Advanced Electronic Materials 2021-01-25

The rapid growth of wearable electronics, Internet Things, smart packaging, and advanced healthcare technologies demand a large number flexible, thin, lightweight, ultralow-cost sensors. accurate precise determination temperature in narrow range (~0–50 °C) around ambient temperatures near-body is critical for most these applications. Temperature sensors based on organic field-effect transistors (OFETs) have the advantages low manufacturing cost, excellent mechanical flexibility, easy...

10.3390/chemosensors10010012 article EN cc-by Chemosensors 2021-12-27

Phase-separated block copolymers (BCPs) that function as precursors to arrays of FePt nanoparticles (NPs) are potential interest for the creation media next-generation high-density magnetic data storage devices. A series bimetallic BCPs has been synthesized by incorporating a complex containing Fe and Pt centers into coordinating four different poly(styrene-b-4-vinylpyridine)s (PS-b-P4VPs, P1–P4). To facilitate phase separation resulting metalated (PM1–PM4), loading FePt-bimetallic...

10.1021/acs.macromol.9b00088 article EN Macromolecules 2019-04-17

The development of design strategies in both ambipolar and electron-conducting organic thin-film transistor (OTFT) materials is important for producing high-performance devices electronics. Isoindigo donor–acceptor polymers have been well studied as hole-conducting OTFTs, while more electron-deficient, acceptor-rich isoindigo underexplored. In this report, two common isoindigo-based polymers, acceptor–acceptor core-expanded structures, are combined to create copolymers bisisoindigo, a...

10.1021/acsaelm.0c00305 article EN ACS Applied Electronic Materials 2020-06-06

A p-type indigo polymer semiconductor is developed for water-gated organic field-effect transistors (WGOFET) sensing fluoride ions.

10.1039/c9ra04302k article EN cc-by RSC Advances 2019-01-01

This work reports development of yttrium doped copper oxide (Y-CuO) as a new hole transport material with supplemented optoelectronic character. The pure and Y-doped CuO thin films are developed through solid-state method at 200 °C recognized high performance p-channel inorganic thin-film transistors (TFTs). is formed by oxidative decomposition acetylacetonate, yielding 100 nm thick conductive (40.9 S cm-1 ) compact band gap 2.47 eV charge carrier density ∼1.44×1019 cm-3 . Yttrium doping...

10.1002/cphc.202000005 article EN ChemPhysChem 2020-02-28

This new non-planar non-fullerene acceptor has low synthetic complexity and shows good performance with P3HT, leading to high industrial accessibility.

10.1039/c9ta08654d article EN Journal of Materials Chemistry A 2019-01-01

Poly(2,3,4,5,6-pentafluorostyrene) (PPFS) can be employed as a solution processable gate dielectric with methyl isobutyl ketone (MIK) for bottom-gate TFTs.

10.1039/d0ma00175a article EN cc-by-nc Materials Advances 2020-01-01

Abstract We report the design, synthesis, and properties of a novel type donor (D)‐acceptor (A) polymer, poly(3‐(([2,2′:5′,2′′‐terthiophen]‐3‐yl‐5,5“‐diyl)methylene)‐1‐(2‐octyldodecyl)indolin‐2‐one) (PTIBT), with backbone acceptor side chains (Type II D‐A polymer) as for organic solar cells (OSCs) opposed to conventional polymers having both units on I polymers). PTIBT consisting thiophene containing indolin‐2‐one was synthesized very conveniently in three steps. This polymer has high...

10.1002/ajoc.202000172 article EN Asian Journal of Organic Chemistry 2020-04-16

Organic semiconductors inherently have a low dielectric constant and hence high exciton binding energy, which is largely responsible for the rather power conversion efficiency of organic solar cells as well requirements to achieve delicate bulk-heterojunction nanophase separation in active layer. In this study, methyl acrylate weakly electron-withdrawing side chain electron rich thiophene prepare new building block, thiophene-3-acrylate (TA), with increased polarity used. A wide bandgap...

10.1002/marc.202200325 article EN Macromolecular Rapid Communications 2022-05-07

A new electron acceptor building block, [2,2′-bithiophene]-4,4′-dicarboxamide, is synthesized and used to develop donor polymers for organic solar cells.

10.1039/c9ra06909g article EN cc-by RSC Advances 2019-01-01

The control of the performance single-walled carbon nanotube (SWCNT) random network-based transistors is critical importance for their applications in electronic devices, such as complementary metal oxide semiconducting (CMOS)-based logics. In ambient conditions, SWCNTs are heavily p-doped by H

10.3390/nano14181477 article EN cc-by Nanomaterials 2024-09-11

Abstract Previously, we developed several carbamate side chain-substituted hemi-isoindigo (HID)-based π -conjugated polymers, which demonstrated excellent sensitivity and stability as the sensing layers in chemiresistive temperature sensors. This work investigated effects of chains on HID units by changing to alkyl chains. Specifically, a series 2-ethylhexyl-substituted poly(3-((3'',4'-bis(dodecyloxy)-[2,2':5',2''-terthiophen]-5-yl) methylene)-1-(2-ethylhexyl)indolin-2-one-6,5”-diyl) (PTAB),...

10.1088/2058-8585/ac968d article EN cc-by Flexible and Printed Electronics 2022-09-30
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