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论文类型：期刊论文

发表时间：2015-06-01

发表刊物：NANO LETTERS

收录刊物：SCIE、EI、PubMed、Scopus

卷号：15

期号：6

页面范围：3748-3756

ISSN号：1530-6984

关键字：Ligand; nanocrystals; dip coating hydrazine; 1,2,ethanedithiol; ethylenediamine; thermoelectric; nanocomposite

摘要：Small molecules with functional groups can show different electron affinity and binding behavior on nanocrystal surface, which in principle could be used to alternate the electrical transport in self-assembled nanocrystal thin films. These small molecules can also serve for scattering the phonons to reduce the thermal conductivity. Here, we present our research on the thermoelectric characteristic of self-assembled silver telluride (Ag2Te) nanocrystal thin films that are fabricated by a layer-by-layer (LBL) dip-coating process. We perform investigations on the electrical conductivity and Seebeck coefficient on the Ag2Te nanocrystal thin films containing hydrazine, 1,2-ethanedithiol, and ethylenediamine between 300 and 400 K. We also use photothermal (PT) technique to obtain the thermal conductivity of the films at room temperature and estimate the thermoelectric figure of merit (ZT). The experimental results suggest that the surface-bound small molecules could serve as a beneficial component to build nanocrystal-based thermoelectric devices operating at low temperature.