Lead Sulfide Quantum Dot Photodetector with Enhanced Responsivity through a Two-Step Ligand-Exchange Method

A highly stable p-type PbS-QDs ink is prepared using a single-step biphasic ligand exchange route, overcoming instability encountered in previous reports. Chemical characterization of the ink reveals 3-mercaptopriopionic acid (MPA)...

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Patternable Quantum-Dot Photoresist with High Photolithographic Uniformity

Science of Advanced Materials ◽

10.1166/sam.2021.3929 ◽

2021 ◽

Vol 13 (4) ◽

pp. 624-631

Author(s):

Jianyao Lin ◽

Yu Chen ◽

Yun Ye ◽

Sheng Xu ◽

Tailiang Guo ◽

...

Keyword(s):

Quantum Dot ◽

Functional Groups ◽

Ligand Exchange ◽

Surface Ligands ◽

Dispersion Mechanism ◽

Film Forming ◽

Photolithography Process ◽

Color Conversion

We present a ligand-exchange-free photo-patternable quantum-dot photoresist (QDPR) with high photolithographic uniformity. The dispersion mechanism between the QD’s surface ligands and the functional groups of photoresist polymers are studied. Results show that the dispersibility and photoluminescent intensity of this QDPR can be both improved by controlling dispersant and antioxidant. For device demonstration, multi-colored quantum dot color conversion films (QDCCF) were prepared and patterned by a photolithography process. High QD dispersibility and film-forming uniformity were both achieved with this QDCCF. It is believed that the proposed QDPR has the potential to be extensively used in lighting or display applications.

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Enhanced lead sulfide quantum dots infrared photodetector performance through ligand exchange

Organic and Hybrid Sensors and Bioelectronics XIV ◽

10.1117/12.2603399 ◽

2021 ◽

Author(s):

Shichen Yin ◽

Franky So ◽

Shuo Ding ◽

Liping Zhu ◽

Qi Dong ◽

...

Keyword(s):

Quantum Dots ◽

Lead Sulfide ◽

Ligand Exchange ◽

Infrared Photodetector ◽

Lead Sulfide Quantum Dots

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Determination of conditional stability constants of organic copper and zinc complexes dissolved in seawater using ligand exchange method with EDTA

Marine Chemistry ◽

10.1016/0304-4203(82)90030-5 ◽

1982 ◽

Vol 11 (4) ◽

pp. 343-354 ◽

Cited By ~ 86

Author(s):

K. Hirose ◽

Y. Dokiya ◽

Y. Sugimura

Keyword(s):

Stability Constants ◽

Ligand Exchange ◽

Zinc Complexes ◽

Conditional Stability ◽

Exchange Method ◽

Copper And Zinc ◽

Organic Copper ◽

Conditional Stability Constants

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Characterization of Colloidal Quantum Dot Ligand Exchange by X-ray Photoelectron Spectroscopy

Journal of Electronic Materials ◽

10.1007/s11664-012-2371-4 ◽

2013 ◽

Vol 42 (5) ◽

pp. 809-814 ◽

Cited By ~ 3

Author(s):

Ayomide Atewologun ◽

Wangyao Ge ◽

Adrienne D. Stiff-Roberts

Keyword(s):

Quantum Dot ◽

Photoelectron Spectroscopy ◽

Ligand Exchange ◽

X Ray ◽

Colloidal Quantum Dot

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Localized Surface Plasmon Resonance Effect of Gold Nanoparticles Using 3-Mercaptopropionic Acid as Capping Material for Sensing Probe

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.891.43 ◽

2021 ◽

Vol 891 ◽

pp. 43-48

Author(s):

Muhammad Tegar Pambudi ◽

Suhandoko Dwi Isro ◽

Priastuti Wulandari

Keyword(s):

Gold Nanoparticles ◽

Surface Plasmon Resonance ◽

Ligand Exchange ◽

Localized Surface Plasmon Resonance ◽

Reduction Method ◽

Colloidal Solution ◽

Localized Surface Plasmon ◽

Exchange Method ◽

Vibrational Peak ◽

Absorbance Spectra

Gold nanoparticles (AuNP) has been used in a wide range of applications especially in medicine and optoelectronic applications due to its localized surface plasmon resonance (LSPR) effect. LSPR observation of AuNP solution shows that the plasmonic peak in the absorbance spectra lies in the range of visible light around 520 nm with deep red-wine color. The optical characteristic is controlled by the size and shape of the nanoparticles including its surface functionalization. Our research is focused on the adsorption study of 3-mercaptopropionate (3-MP) on AuNP (AuMP) surface synthesized by ligand exchange method and also by direct reduction method. The characterizations are conducted by use of UV-vis and FTIR spectroscopies in order to investigate the effect of LSPR. The absorbance spectra show that both experimental methods of AuMP give a similar profile of red-shifted in the plasmonic peaks in comparison to that of citrate-capped AuNP as a reference from 519 nm to 520 nm. The ligand exchange method of AuMP synthesis results in an unstable colloidal solution after being stored for a week at room temperature while the reduction method results in a stable colloidal solution of AuMP even though it has been stored for 2 months. The FTIR spectra show the difference in vibrational peak intensities between the 3-MP on AuNP and the 3-MPA as reference. The peak of carboxylate (COO-) asymmetric stretching is shifted to low frequency from 1708 cm-1 to 1632 cm-1 indicate the effect of LSPR while the shift to high frequencies for some vibrational peak intensities relates to the strong effect of chemical coordination between gold and capping material. The simulation of the vibration energy by use of the Density Functional Theory (DFT) method shows a similar tendency to that of the peak intensities along the infrared spectrum from experimental results.

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