Facile Ligand Exchange of Ionic Ligand-Capped Amphiphilic Ag<sub>2</sub>S Nanocrystals for High Conductive Thin Films
- Authors
- Sung, Yunmo; Kim, Hyun Beom; Kim, Ji Heon; Noh, Yoona; Yu, Jaesang; Yang, Jaesung; Kim, Tae Hyun; Oh, Juwon
- Issue Date
- Jan-2024
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Ag2S nanocrystals; ligand exchange; phase transfer; ionic ligand; conductive nanocrystalfilm
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.16, no.3, pp 3853 - 3861
- Pages
- 9
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 16
- Number
- 3
- Start Page
- 3853
- End Page
- 3861
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/26035
- DOI
- 10.1021/acsami.3c15472
- ISSN
- 1944-8244
1944-8252
- Abstract
- A surface ligand modification of colloidal nanocrystals (NCs) is one of the crucial issues for their practical applications because of the highly insulating nature of native long-chain ligands. Herein, we present straightforward methods for phase transfer and ligand exchange of amphiphilic Ag2S NCs and the fabrication of highly conductive films. S-terminated Ag2S (S-Ag2S) NCs are capped with ionic octylammonium (OctAH(+)) ligands to compensate for surface anionic charge, S2-, of the NC core. An injection of polar solvent, formamide (FA), into S-Ag2S NCs dispersed in toluene leads to an additional envelopment of the charged S-Ag2S NC core by FA due to electrostatic stabilization, which allows its amphiphilic nature and results in a rapid and effective phase transfer without any ligand addition. Because the solvation by FA involves a dissociation equilibrium of the ionic OctAH(+) ligands, controlling a concentration of OctAH(+) enables this phase transfer to show reversibility. This underlying chemistry allows S-Ag2S NCs in FA to exhibit a complete ligand exchange to Na+ ligands. The S-Ag2S NCs with Na+ ligands show a close interparticle distance and compatibility for uniformly deposited thin films by a simple spin-coating method. In photoelectrochemical measurements with stacked Ag2S NCs on ITO electrodes, a 3-fold enhanced current response was observed for the ligand passivation of Na+ compared to OctAH(+), indicating a significantly enhanced charge transport in the Ag2S NC film by a drastically reduced interparticle distance due to the Na+ ligands.
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Collections - College of Natural Sciences > Department of Chemistry > 1. Journal Articles
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