Photosensitive Thin Films Based on Drop Cast and Langmuir-Blodgett Hydrophilic and Hydrophobic CdS Nanoparticles
| Autor: | Justyna Widera-Kalinowska, K. Jackowska, Magdalena Osial, Momoka Nagamine, Paweł Krysiński |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
langmuir-blodgett technique General Chemical Engineering Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Langmuir–Blodgett film Article lcsh:Chemistry chemistry.chemical_compound Oleylamine General Materials Science Thin film Photocurrent Carrier lifetime 021001 nanoscience & nanotechnology CdS Nanocrystalline material Cadmium sulfide photoelectrochemical studies 0104 chemical sciences lcsh:QD1-999 thin films chemistry Chemical engineering 0210 nano-technology |
| Zdroj: | Nanomaterials Volume 10 Issue 12 Nanomaterials, Vol 10, Iss 2437, p 2437 (2020) |
| ISSN: | 2079-4991 |
| Popis: | Comparative photoelectrochemical studies of cadmium sulfide (CdS) nanoparticles with either hydrophilic or hydrophobic surface properties are presented. Oleylamine organic shells provided CdS nanoparticles with hydrophobic behavior, affecting the photoelectrochemical properties of such nanostructured semiconductor. Hydrophilic CdS nanoparticles were drop-cast on the electrode, whereas the hydrophobic ones were transferred in a controlled manner with Langmuir-Blodgett technique. The substantial hindrance of photopotential and photocurrent was observed for L-B CdS films as compared to the hydrophilic, uncoated nanoparticles that were drop-cast directly on the electrode surface. The electron lifetime in both hydrophilic and hydrophobic nanocrystalline CdS was determined, revealing longer carrier lifetime for oleylamine coated CdS nanoparticles, ascribed to the trapping of charge at the interface of the organic shell/CdS nanoparticle and to the dominant influence of the resistance of the organic shell against the flux of charges. The &ldquo on&rdquo transients of the photocurrent responses, observed only for the oleylamine-coated nanoparticles, were resolved, yielding the potential-dependent rate constants of the redox processes occurring at the interface. |
| Databáze: | OpenAIRE |
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