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<p>The rational design of low-dimensional heterostructures is crucial for next-generation electronic and thermoelectric materials. Here, we report a versatile colloidal-phase strategy for synthesizing one-dimensional PbTe-Ag₂Te and PbTe-Cu₁.₇₅Te superlattice nanowires (SLNWs) using Te-PbTe heterostructure (HS) nanowires as sacrificial templates. Selective conversion of exposed Te segments through reaction-limited dewetting and galvanic replacement enables periodic modulation of composition along the nanowire axis, producing superlattice architectures with atomically sharp interfaces. Systematic control of precursor concentration, solvent environment, and reaction time allows precise tuning of segment thickness, shell formation, and interfacial quality. Structural and microstructural analysis using XRD, FESEM, TEM, and HRTEM confirms single-crystalline PbTe domains epitaxially coupled to Ag₂Te or Cu₁.₇₅Te, with well-defined crystallographic relationships between adjoining phases. The resulting hetero-structured nanowires combine materials with contrasting electronic and photonic characteristics, offering a platform for interface-engineered carrier filtering and phonon scattering. This work establishes a generalizable, solution-based route for fabricating compositionally modulated metal–telluride superlattices and provides insights into the kinetic and thermodynamic factors governing their formation. The approach is broadly applicable for designing tailored nanoscale heterostructures for thermoelectric, optoelectronic, and energy-conversion applications.</p>

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Solution-phase engineering of PbTe-Ag2Te and PbTe-Cu1.75 Te superlattice nanowires

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Debadarshini Samantaray,
  • Sandhra Sajeevan,
  • Anupam Mishra

摘要

The rational design of low-dimensional heterostructures is crucial for next-generation electronic and thermoelectric materials. Here, we report a versatile colloidal-phase strategy for synthesizing one-dimensional PbTe-Ag₂Te and PbTe-Cu₁.₇₅Te superlattice nanowires (SLNWs) using Te-PbTe heterostructure (HS) nanowires as sacrificial templates. Selective conversion of exposed Te segments through reaction-limited dewetting and galvanic replacement enables periodic modulation of composition along the nanowire axis, producing superlattice architectures with atomically sharp interfaces. Systematic control of precursor concentration, solvent environment, and reaction time allows precise tuning of segment thickness, shell formation, and interfacial quality. Structural and microstructural analysis using XRD, FESEM, TEM, and HRTEM confirms single-crystalline PbTe domains epitaxially coupled to Ag₂Te or Cu₁.₇₅Te, with well-defined crystallographic relationships between adjoining phases. The resulting hetero-structured nanowires combine materials with contrasting electronic and photonic characteristics, offering a platform for interface-engineered carrier filtering and phonon scattering. This work establishes a generalizable, solution-based route for fabricating compositionally modulated metal–telluride superlattices and provides insights into the kinetic and thermodynamic factors governing their formation. The approach is broadly applicable for designing tailored nanoscale heterostructures for thermoelectric, optoelectronic, and energy-conversion applications.