TY - JOUR
T1 - Investigation of the Chemical Effect of Solvent during Ligand Exchange on Nanocrystal Thin Films for Wearable Sensor Applications
AU - Jeon, Sanghyun
AU - Ahn, Junhyuk
AU - Kim, Haneun
AU - Woo, Ho Kun
AU - Bang, Junsung
AU - Lee, Woo Seok
AU - Kim, Donggyu
AU - Hossain, Md Ashraf
AU - Oh, Soong Ju
N1 - Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2019R1C1C1003319), and Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT(NRF-2018M3D1A1059001).
PY - 2019/5/2
Y1 - 2019/5/2
N2 - Ligand exchange processes have been attracting tremendous interest and are necessary when fabricating nanocrystal (NC) thin films for various applications. As ligand exchange processes are based on solution treatment processes, understanding solvents' effects on the ligand exchange process is necessary. Herein, we investigated the effects of exchanging solvents and rinsing solvents on silver (Ag) NC thin films during the ligand exchanging and rinsing steps. We studied the relationships between solvent properties, such as polarity and steric hindrance, and the structural, electronic, and electromechanical properties of NC thin films. A model system was proposed to explain the obtained relationships. We found that exchanging solvents and rinsing solvents during the ligand exchange process should be separated to regulate the ligand exchange process so that films with desired properties can be obtained. Films optimized for different purposes (highly conductive/highly electromechanically sensitive) were fabricated with the same materials and ligands using different solvents for each process. On the basis of these films, we fabricated a flexible strain sensor using an all-solution process at room temperature. This device exhibits excellent performance, including a high gauge factor up to 400, and high reliability, and stability; furthermore, it can detect minute human motion and sound.
AB - Ligand exchange processes have been attracting tremendous interest and are necessary when fabricating nanocrystal (NC) thin films for various applications. As ligand exchange processes are based on solution treatment processes, understanding solvents' effects on the ligand exchange process is necessary. Herein, we investigated the effects of exchanging solvents and rinsing solvents on silver (Ag) NC thin films during the ligand exchanging and rinsing steps. We studied the relationships between solvent properties, such as polarity and steric hindrance, and the structural, electronic, and electromechanical properties of NC thin films. A model system was proposed to explain the obtained relationships. We found that exchanging solvents and rinsing solvents during the ligand exchange process should be separated to regulate the ligand exchange process so that films with desired properties can be obtained. Films optimized for different purposes (highly conductive/highly electromechanically sensitive) were fabricated with the same materials and ligands using different solvents for each process. On the basis of these films, we fabricated a flexible strain sensor using an all-solution process at room temperature. This device exhibits excellent performance, including a high gauge factor up to 400, and high reliability, and stability; furthermore, it can detect minute human motion and sound.
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U2 - 10.1021/acs.jpcc.9b01340
DO - 10.1021/acs.jpcc.9b01340
M3 - Article
AN - SCOPUS:85065170880
SN - 1932-7447
VL - 123
SP - 11001
EP - 11010
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 17
ER -