研究目的
Investigating the effect of ligand treatment on the tuning of infrared-plasmonic indium-tin-oxide nanocrystal electrochromic devices.
研究成果
The study demonstrates that EDT treatment of ITO nanocrystal films provides superior electrochromic performance compared to FA treatment, attributed to the advantageous micro and nanostructure of the EDT-treated films. This treatment avoids the formation of cracks and results in a more favorable plasmon resonance energy shift, enhancing the device's modulation capability. The findings suggest that EDT treatment is a promising candidate for scaling up the fabrication of electrochromic devices for smart window applications.
研究不足
The study is limited by the thickness of the electrochromic devices due to the strong absorbance by the electrolyte at longer wavelengths. Additionally, the comparison between different ligand treatments may depend on other parameters such as the number of deposited nanocrystal layers.
1：Experimental Design and Method Selection:
The study compares two ligand treatment methods for ITO nanocrystal films: formic acid (FA) and ethanedithiol (EDT). The overall design rationale is to optimize the contrast between the blocking and transmitting states of the device by altering the surface morphology and plasmonic properties of the nanocrystals.
2：Sample Selection and Data Sources:
ITO nanocrystals synthesized via a hot injection method with a size of
3：5 nm ± 1 nm and a Sn concentration of 10% were used. The nanocrystals were spin-cast on glass substrates to form films. List of Experimental Equipment and Materials:
Instruments included a Perkin Elmer spectrometer (LAMBDA 950) for absorbance measurements, a Schottky field emission scanning electron microscope (JSM-7610F) for surface morphology analysis, and a Veeco Dimension 3100 Microscope for AFM measurements. Materials included ITO nanocrystals, formic acid, ethanedithiol, and propylene carbonate as the electrolyte.
4：Experimental Procedures and Operational Workflow:
The nanocrystal films were treated with either FA or EDT ligands, followed by characterization of their optical and electrochemical properties. The electrochromic devices were assembled and their performance was evaluated under various applied voltages.
5：Data Analysis Methods:
The optical density changes were analyzed to determine the electrochromic performance, and the surface morphology was examined to correlate with the device's efficiency.
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