---
OA_place: publisher
OA_type: free access
_id: '21821'
abstract:
- lang: eng
  text: "Molecular photoswitches provide a means for imparting synthetic structures
    with intrinsically logical and highly\r\ntunable photoresponsive properties. One
    variety of organic photoswitches known as Donor-Acceptor Stenhouse\r\nAdducts,
    or DASAs, are promising candidates for next generation light responsive materials
    because of their\r\nunique ability to stabilize three photochemically distinct
    isomeric states in solution, while their counterparts are\r\nstrictly limited
    to binary state behavior. In this work, we show how polymethacrylate host matrices
    shift the\r\nenergetic landscape of DASA relative to solution, prohibiting accumulation
    of an intermediate third isomeric\r\nstate by decelerating critical steps in the
    photoswitching mechanism. Specifically, we employ a dual-wavelength,\r\nphase
    locked detection scheme to probe thermal isomerizations in the switching process
    that occur at fast (~ms)\r\ntime scales that are inaccessible by standard UV–Vis
    spectroscopic techniques. The results of this study provide\r\nvaluable insight
    into the mechanism of multistate DASA reactivity and establish the foundation
    necessary to\r\nguide future efforts in offsetting kinetic matrix effects to enable
    dynamic, three state photoswitching in polymeric\r\nhosts. "
article_number: '114964'
article_processing_charge: No
article_type: original
author:
- first_name: Sara
  full_name: Sandlass, Sara
  last_name: Sandlass
- first_name: Friedrich J
  full_name: Stricker, Friedrich J
  id: 7aca2cfc-46cf-11f0-abd3-8c96b5186745
  last_name: Stricker
- first_name: Daniel
  full_name: Fragoso, Daniel
  last_name: Fragoso
- first_name: Javier Read
  full_name: de Alaniz, Javier Read
  last_name: de Alaniz
- first_name: Michael J.
  full_name: Gordon, Michael J.
  last_name: Gordon
citation:
  ama: 'Sandlass S, Stricker FJ, Fragoso D, de Alaniz JR, Gordon MJ. Effect of polymer
    host matrix on multi-stage isomerization kinetics of DASA photochromes. <i>Journal
    of Photochemistry and Photobiology A: Chemistry</i>. 2023;444. doi:<a href="https://doi.org/10.1016/j.jphotochem.2023.114964">10.1016/j.jphotochem.2023.114964</a>'
  apa: 'Sandlass, S., Stricker, F. J., Fragoso, D., de Alaniz, J. R., &#38; Gordon,
    M. J. (2023). Effect of polymer host matrix on multi-stage isomerization kinetics
    of DASA photochromes. <i>Journal of Photochemistry and Photobiology A: Chemistry</i>.
    Elsevier. <a href="https://doi.org/10.1016/j.jphotochem.2023.114964">https://doi.org/10.1016/j.jphotochem.2023.114964</a>'
  chicago: 'Sandlass, Sara, Friedrich J Stricker, Daniel Fragoso, Javier Read de Alaniz,
    and Michael J. Gordon. “Effect of Polymer Host Matrix on Multi-Stage Isomerization
    Kinetics of DASA Photochromes.” <i>Journal of Photochemistry and Photobiology
    A: Chemistry</i>. Elsevier, 2023. <a href="https://doi.org/10.1016/j.jphotochem.2023.114964">https://doi.org/10.1016/j.jphotochem.2023.114964</a>.'
  ieee: 'S. Sandlass, F. J. Stricker, D. Fragoso, J. R. de Alaniz, and M. J. Gordon,
    “Effect of polymer host matrix on multi-stage isomerization kinetics of DASA photochromes,”
    <i>Journal of Photochemistry and Photobiology A: Chemistry</i>, vol. 444. Elsevier,
    2023.'
  ista: 'Sandlass S, Stricker FJ, Fragoso D, de Alaniz JR, Gordon MJ. 2023. Effect
    of polymer host matrix on multi-stage isomerization kinetics of DASA photochromes.
    Journal of Photochemistry and Photobiology A: Chemistry. 444, 114964.'
  mla: 'Sandlass, Sara, et al. “Effect of Polymer Host Matrix on Multi-Stage Isomerization
    Kinetics of DASA Photochromes.” <i>Journal of Photochemistry and Photobiology
    A: Chemistry</i>, vol. 444, 114964, Elsevier, 2023, doi:<a href="https://doi.org/10.1016/j.jphotochem.2023.114964">10.1016/j.jphotochem.2023.114964</a>.'
  short: 'S. Sandlass, F.J. Stricker, D. Fragoso, J.R. de Alaniz, M.J. Gordon, Journal
    of Photochemistry and Photobiology A: Chemistry 444 (2023).'
date_created: 2026-05-06T10:57:28Z
date_published: 2023-10-01T00:00:00Z
date_updated: 2026-05-18T09:19:40Z
day: '01'
ddc:
- '540'
doi: 10.1016/j.jphotochem.2023.114964
extern: '1'
intvolume: '       444'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.1016/j.jphotochem.2023.114964
month: '10'
oa: 1
oa_version: Published Version
publication: 'Journal of Photochemistry and Photobiology A: Chemistry'
publication_identifier:
  eissn:
  - 1873-2666
  issn:
  - 1010-6030
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Effect of polymer host matrix on multi-stage isomerization kinetics of DASA
  photochromes
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 444
year: '2023'
...
---
_id: '1737'
abstract:
- lang: eng
  text: A new solvent-free composite polymer electrolyte consisting of high-molecular
    mass polyethylene oxide (PEO) filled with titanium oxide and containing LiI and
    I2 was developed. The introduction of the inorganic filler (TiO2 Degussa P25)
    into the polymer matrix produces dramatic morphological changes to the host polymer
    structure. Upon addition of the inorganic oxide, the surface roughness increases,
    with respect to the original polymer and in parallel, the fractal dimension decreases.
    Both the thermograms and the atomic force microscope (AFM) pictures confirm the
    amorphicity of the composite electrolyte. The polymer sub-units are held together
    in a parallel orientation, forming straight long chains of about 500 nm in width,
    along which TiO2 spherical particles of about 20-25 nm in diameter are distributed.
    The polymer chains separated by the titania particles are arranged in a three-dimensional,
    mechanically stable network, that creates free space and voids into which the
    iodide/triodide anions can easily migrate. All solid-state dye-sensitized solar
    cells fabricated using this composite electrolyte present high efficiencies (typical
    maximum incident photon to current efficiency (IPCE) as high as 40% at 520 nm
    and overall conversion efficiency (η) of 0.96% (Voc = 0.67 V, Jsc = 2.050 mA/cm2,
    FF = 39%) under direct solar irradiation. Further improvement of the photovoltaic
    performance is expected by optimization of the electrolyte parameters and of the
    cell assembly.
acknowledgement: Financial support from NCSR “Demokritos” (Dimoerevna 598 project),
  Empeirikeion Foundation and General Secretariat for Research and Technology of Greece
  (EPET II, Greece–France and Greece–Czech Republic bilateral collaboration projects)
  is also greatly acknowledged. G. Katsaros thanks the Greek State Scholarships Foundation
  (IKY) for fellowship allowance
article_processing_charge: No
author:
- first_name: Georgios
  full_name: Katsaros, Georgios
  id: 38DB5788-F248-11E8-B48F-1D18A9856A87
  last_name: Katsaros
- first_name: Thomas
  full_name: Stergiopoulos, Thomas
  last_name: Stergiopoulos
- first_name: Iannis
  full_name: Arabatzis, Iannis
  last_name: Arabatzis
- first_name: Kyriaki
  full_name: Papadokostaki, Kyriaki
  last_name: Papadokostaki
- first_name: Polycarpos
  full_name: Falaras, Polycarpos
  last_name: Falaras
citation:
  ama: 'Katsaros G, Stergiopoulos T, Arabatzis I, Papadokostaki K, Falaras P. A solvent-free
    composite polymer/inorganic oxide electrolyte for high efficiency solid-state
    dye-sensitized solar cells. <i>Journal of Photochemistry and Photobiology A: Chemistry</i>.
    2002;149(1-3):191-198. doi:<a href="https://doi.org/10.1016/S1010-6030(02)00027-8">10.1016/S1010-6030(02)00027-8</a>'
  apa: 'Katsaros, G., Stergiopoulos, T., Arabatzis, I., Papadokostaki, K., &#38; Falaras,
    P. (2002). A solvent-free composite polymer/inorganic oxide electrolyte for high
    efficiency solid-state dye-sensitized solar cells. <i>Journal of Photochemistry
    and Photobiology A: Chemistry</i>. Elsevier. <a href="https://doi.org/10.1016/S1010-6030(02)00027-8">https://doi.org/10.1016/S1010-6030(02)00027-8</a>'
  chicago: 'Katsaros, Georgios, Thomas Stergiopoulos, Iannis Arabatzis, Kyriaki Papadokostaki,
    and Polycarpos Falaras. “A Solvent-Free Composite Polymer/Inorganic Oxide Electrolyte
    for High Efficiency Solid-State Dye-Sensitized Solar Cells.” <i>Journal of Photochemistry
    and Photobiology A: Chemistry</i>. Elsevier, 2002. <a href="https://doi.org/10.1016/S1010-6030(02)00027-8">https://doi.org/10.1016/S1010-6030(02)00027-8</a>.'
  ieee: 'G. Katsaros, T. Stergiopoulos, I. Arabatzis, K. Papadokostaki, and P. Falaras,
    “A solvent-free composite polymer/inorganic oxide electrolyte for high efficiency
    solid-state dye-sensitized solar cells,” <i>Journal of Photochemistry and Photobiology
    A: Chemistry</i>, vol. 149, no. 1–3. Elsevier, pp. 191–198, 2002.'
  ista: 'Katsaros G, Stergiopoulos T, Arabatzis I, Papadokostaki K, Falaras P. 2002.
    A solvent-free composite polymer/inorganic oxide electrolyte for high efficiency
    solid-state dye-sensitized solar cells. Journal of Photochemistry and Photobiology
    A: Chemistry. 149(1–3), 191–198.'
  mla: 'Katsaros, Georgios, et al. “A Solvent-Free Composite Polymer/Inorganic Oxide
    Electrolyte for High Efficiency Solid-State Dye-Sensitized Solar Cells.” <i>Journal
    of Photochemistry and Photobiology A: Chemistry</i>, vol. 149, no. 1–3, Elsevier,
    2002, pp. 191–98, doi:<a href="https://doi.org/10.1016/S1010-6030(02)00027-8">10.1016/S1010-6030(02)00027-8</a>.'
  short: 'G. Katsaros, T. Stergiopoulos, I. Arabatzis, K. Papadokostaki, P. Falaras,
    Journal of Photochemistry and Photobiology A: Chemistry 149 (2002) 191–198.'
date_created: 2018-12-11T11:53:44Z
date_published: 2002-06-28T00:00:00Z
date_updated: 2023-07-26T08:56:55Z
day: '28'
doi: 10.1016/S1010-6030(02)00027-8
extern: '1'
intvolume: '       149'
issue: 1-3
language:
- iso: eng
month: '06'
oa_version: None
page: 191 - 198
publication: 'Journal of Photochemistry and Photobiology A: Chemistry'
publication_identifier:
  issn:
  - 1010-6030
publication_status: published
publisher: Elsevier
publist_id: '5387'
status: public
title: A solvent-free composite polymer/inorganic oxide electrolyte for high efficiency
  solid-state dye-sensitized solar cells
type: journal_article
user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17
volume: 149
year: '2002'
...