Journal
ACS NANO
Volume 13, Issue 6, Pages 6572-6580Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b00346
Keywords
colloidal nanoparticles; asymmetric nanoparticles; inorganic ligands; heterostructures; catalyst assisted growth; nanocomposites; thermoelectrics
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Funding
- European Union (EU) via FP7 ERC Starting Grant 2012 (Project NANO SOLID, GA) [306733]
- IST Austria
- ETH Zurich via an ETH career seed grant [SEED-18 16-2]
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [754411]
- Generalitat de Catalunya [2014SGR1638, 2017 SGR 327]
- Spanish MINECO project [ENE2017-85087-C3]
- Severo Ochoa program from Spanish MINECO [SEV-2017-0706]
- CERCA Programme/Generalitat de Catalunya
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Methodologies that involve the use of nano particles as artificial atoms to rationally build materials in a bottom-up fashion are particularly well-suited to control the matter at the nanoscale. Colloidal synthetic routes allow for an exquisite control over such artificial atoms in terms of size, shape, and crystal phase as well as core and surface compositions. We present here a bottom-up approach to produce Pb-Ag-K-S-Te nanocomposites, which is a highly promising system for thermoelectric energy conversion. First, we developed a high-yield and scalable colloidal synthesis route to uniform lead sulfide (PbS) nanorods, whose tips are made of silver sulfide (Ag2S). We then took advantage of the large surface-to-volume ratio to introduce a p-type dopant (K) by replacing native organic ligands with K2Te. Upon thermal consolidation, K2Te-surface modified PbS-Ag2S nanorods yield p-type doped nanocomposites with PbTe and PbS as major phases and Ag2S and Ag2Te as embedded nanoinclusions. Thermoelectric characterization of such consolidated nanosolids showed a high thermoelectric figure-of-merit of 1 at 620 K.
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