The electrical resistivity and thermopower of solid noble metals

Dreirach, O

doi:10.1088/0305-4608/3/3/016

Cited by 11 publications

(1 citation statement)

References 26 publications

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“…In noble metals such as gold, the positive sign of S primarily stems from the energy dependence of the electron mean free path. , Altering the electronic scattering properties of a noble metal by introducing impurity atoms can result in large changes in S . The effects of impurities such as Mn, Pd, and Pt on S of bulk gold and the other noble metals have been studied for decades. − At room temperature, alloying gold with even 0.5% platinum has been demonstrated to change the sign of S from positive to negative, as the foreign atoms increase the energy-dependent scattering cross section, which affects both the phononic and electronic contributions to S . , Further increasing the platinum concentration in the alloy results in an increasingly negative S .…”

Section: Introductionmentioning

confidence: 99%

Detection of Trace Impurity Gradients in Noble Metals by the Photothermoelectric Effect

et al. 2021

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Trace impurity concentrations in noble metals can have profound effects on chemical and physical properties, yet detecting these impurity concentrations remains a challenge using typical spectroscopic characterization tools and specialized techniques such as secondary ion mass spectrometry. In this work, we demonstrate that the photothermoelectric effect can be leveraged to detect low-concentration platinum gradients in wire-shaped gold nanostructures with high sensitivity. The photothermoelectric voltage measurements show significant contributions from platinum impurities to the bulk Seebeck coefficient of gold at length scales that agree with theoretical platinum diffusion lengths. Using finite element modeling, the Seebeck distribution is calculated for the gold− platinum system, showing that even a 0.01% variation in platinum concentration along a 1 μm length of gold wire can contribute significantly to the local Seebeck coefficient. These measurements indicate that the photothermoelectric effect can be a highly sensitive tool for detecting low-level impurity concentrations in host metals in a wire geometry.

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