AFM-IR of EHD-Printed PbS Quantum Dots: Quantifying Ligand Exchange at the Nanoscale
arxiv(2024)
摘要
Colloidal quantum dots (cQDs) recently emerged as building blocks for
semiconductor materials with tuneable properties. Electro-hydrodynamic printing
can be used to obtain sub-micrometre patterns of cQDs without elaborate and
aggressive photolithography steps. Post-deposition ligand exchange is necessary
for the introduction of new functionalities into cQD solids. However, achieving
a complete bulk exchange is challenging and conventional infrared spectroscopy
lacks the required spatial resolution. Infrared nanospectroscopy (AFM-IR)
enables quantitative analysis of the evolution of vibrational signals and
structural topography on the nano-metre scale upon ligand substitution on lead
sulphide (PbS) cQDs. A solution of ethane-dithiol in acetonitrile demonstrated
rapid ( 60 s) and controllable exchange of approximately 90
encompassing structures up to 800 nm in thickness. Prolonged exposures (>1 h)
led to the degradation of the microstructures, with a systematic removal of
cQDs regulated by surface-to-bulk ratios and solvent interactions. This study
establishes a method for the development of devices through a combination of
tuneable photoactive materials, additive manufacturing of microstructures, and
their quantitative nanometre-scale analysis.
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