Photoelectric Response from Nanofibous Membranes

2001 ◽  
Vol 708 ◽  
Author(s):  
Kris J. Senecal ◽  
David P. Ziegler ◽  
Jinan He ◽  
Ravi Mosurkal ◽  
Heidi Schreuder-Gibson ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Photovoltaic Devices ◽  
Dye Sensitized ◽  
Photoelectric Response ◽  
Surface Areas ◽  
Phthalocyanine Dyes ◽  
Electrospun Membranes ◽  
Nanofibrous Membranes ◽  
Polymeric Solutions ◽  
Nanoscale Fibers

ABSTRACTElectrospinning has been used to prepare nanofibrous composite membranes of semi-conducting particles (TiO2) and photovoltaic dyes. Electrospinning is a relatively simple technique where electrical forces are used on polymeric solutions to produce nanoscale fibers. The resulting nanofibrous membranes have surface areas that are roughly one to two orders of magnitude higher than conventional thin films. It is believed that this higher surface will allow for more efficient light harvesting in photovoltaic devices. Our research has focused on the fabrication of organic/inorganic hybrid solar cells featuring dye sensitized nanocrystalline semiconductor particles using electrospinning. Phthalocyanine and N3 (cisdi(thiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylate) ruthenium(II)) photoactive dyes were electrospun with semi-conductive TiO2 nanoparticles into a matrix polymer, polyacrylonitrile (PAN). Electron microscopy and elemental analysis of the electrospun membranes shows that each component is present and uniformly dispersed in the nanofibrous membranes. In general, the dye membranes electrospun with the TiO2 nanoparticles exhibited a greater photoelectric response than the membranes with dye only. The N3 dye membranes however showed the greatest photoresponse in comparison to the phthalocyanine dyes, with or without the TiO2 nanoparticles. Photoelectric responses on the order of 30 μA and 280 mV were achieved with dye-sensitized membranes and are believed to be the first demonstration of a photoelectric response from an electrospun nanofibrous membrane.

Highly Sensitive Optical Sensors Using Electrospun Polymeric Nanofibrous Membranes

2001 ◽  
Vol 708 ◽  
Author(s):  
Xianyan Wang ◽  
Soo-Hyoung. Lee ◽  
Christopher Drew ◽  
Kris J. Senecal ◽  
Jayant Kumar ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Sensors ◽  
Polyacrylic Acid ◽  
Covalent Attachment ◽  
Layer By Layer ◽  
Electrospun Membrane ◽  
Surface Areas ◽  
Highly Sensitive ◽  
Electrospun Membranes ◽  
Nanofibrous Membranes

ABSTRACTIn recent years, polymer films have found an increasing role in sensors due to their unique characteristics. It is widely accepted that the sensitivity of a film is proportional to the surface area per unit mass. Thin films with very large surface areas can be easily fabricated by electrospinning, wherein a polymer solution is exposed to a high static voltage, creating sub-micron or nanometer scale fibers collected as a non-woven membrane. Electrospun nanofibrous membranes have surface areas approximately one to two orders of the magnitude higher than those found in continuous thin films. It is expected that their sensitivities are potentially as large. In this paper, the first use of an electrospun membrane as a highly responsive fluorescence quenching-based optical sensor is reported. A new fluorescent polymer, polyacrylic acid - poly (pyrene methanol) (PAA-PM), was synthesized via covalent attachment of the fluorescent indicator, pyrene methanol (PM), onto polyacrylic acid (PAA). Optical chemical sensors were then fabricated by electrospinning PAA-PM and thermal crosslinkable polyurethane latex mixture solutions. The synthesis, characterization, electrospinning fabrication, and comparison of the sensitivities to analytes such as ferric ions, mercury, and 2,4-dinitrotoluene between the electrospun membranes and electrostatically layer-by-layer (ELBL) assembled films are presented.

Multifunctional Mesoporous Nanocomposites

2012 ◽  
Vol 736 ◽  
pp. 98-119 ◽  
Author(s):  
Shilpi Banerjee ◽  
Dipankar Chakravorty
Keyword(s):  
Gas Sensors ◽  
Mesoporous Carbon ◽  
Dye Sensitized Solar Cells ◽  
Lithium Ion ◽  
Magnetic Sensors ◽  
Dye Sensitized ◽  
Surface Areas ◽  
Reaction Processes ◽  
Sensitized Solar Cells ◽  
Mesoporous Structures

Multifunctional behaviour viz., ferroelectric, ferromagnetic and magnetodielectric coupling has been reported in a number of nanocomposites. The latter were synthesized by growing nanoparticles of different kinds within a suitable matrix. Different morphologies of the particles were introduced. Both natural as well as synthetic mesoporous materials were used to prepare nanocomposite systems. Mesoporous structures with large surface areas and pore volumes were found to be effective in developing most efficient drug delivery systems. For identical reasons such structures were suitable as catalysts in various industrially important reaction processes, as humidity and gas sensors, as magnetic sensors. Mesoporous carbon based nanocomposites used as electrodes were found to improve the efficiency of lithium-ion batteries. Nanocomposites using mesoporous carbon and carbon nanotubes were shown to improve the performance of dye sensitized solar cells. In this article, the above mentioned developments are reviewed and discussed.

Graphene-based large area dye-sensitized solar cell modules

Nanoscale ◽  
2016 ◽  
Vol 8 (9) ◽  
pp. 5368-5378 ◽  
Author(s):  
Simone Casaluci ◽  
Mauro Gemmi ◽  
Vittorio Pellegrini ◽  
Aldo Di Carlo ◽  
Francesco Bonaccorso
Keyword(s):  
Solar Cell ◽  
Spray Coating ◽  
Cost Effective ◽  
Dye Sensitized Solar Cell ◽  
Photovoltaic Devices ◽  
Large Area ◽  
Dye Sensitized ◽  
Cell Modules ◽  
Viable Method ◽  
The Way

We demonstrated the spray coating of graphene ink as a viable method for large-area fabrication of graphene-based dye-sensitized solar cell modules, paving the way to all-printed, transparent and cost-effective large-area photovoltaic devices.

Electrospun membranes of imidazole-grafted PVDF-HFP polymeric ionic liquids for highly efficient quasi-solid-state dye-sensitized solar cells

2018 ◽  
Vol 6 (29) ◽  
pp. 14215-14223 ◽  
Author(s):  
Hao-Wei Pang ◽  
Hsin-Fu Yu ◽  
Yi-June Huang ◽  
Chun-Ting Li ◽  
Kuo-Chuan Ho
Keyword(s):  
Ionic Liquids ◽  
Solar Cells ◽  
Solid State ◽  
Dye Sensitized Solar Cells ◽  
Polymeric Ionic Liquids ◽  
Long Term Stability ◽  
Dye Sensitized ◽  
Electrospun Membranes ◽  
Sensitized Solar Cells

The PFII membranes have three functions that render the DSSC with η of 9.26% and long-term stability over 1500 h (up to 97% of its initial η).

scholarly journals Adsorptive molecularly imprinted composite membranes for chiral separation of phenylalanine

2016 ◽  
Vol 18 (3) ◽  
pp. 22-29 ◽  
Author(s):  
Nasrullah Shah ◽  
Touseef Rehan ◽  
Joong Kon Park
Keyword(s):  
Composite Membrane ◽  
Chiral Separation ◽  
Phase Inversion ◽  
Composite Membranes ◽  
Adsorption Selectivity ◽  
Molecularly Imprinted ◽  
Phase Inversion Technique ◽  
Uniform Dispersion ◽  
Polymeric Solutions ◽  
And Control

Abstract Two types of composite imprinted membranes, i.e., composite membrane comprised of D-Phe imprinted beads and D-Phe imprinted membrane or DCM and composite membrane comprised of L-Phe imprinted beads and L-Phe imprinted membranes or LCM, were synthesized by phase inversion technique after a uniform dispersion of beads within the polymeric solutions using simple physico-mechanical process. The assemblies of the prepared DCM, LCM and control membranes were employed in ultrafiltration for chiral separation of D, L-Phenylalanine racemate solution. DCM and LCM showed an improved adsorption capacity (0.334 mg g-1 and 0.365 mg g-1 respectively), and adsorption selectivity (2.72 and 2.98 respectively). However, the percent rejection of the template and counter enantiomer were lower than that of control membranes. Compared to control membrane, the DCM and LCM showed inverse permselectivity. These composite membranes having better adsorption and separation ability for Phenylalanine racemate solution will be suitable in the future for various other applications.

Sign in / Sign up

Export Citation Format

Share Document