Function follows form: From semiconducting to metallic towards superconducting PbS nanowires by faceting the crystal

Abstract

In the realm of colloidal nanostructures, with its immense capacity for shape and dimensionality control, the form is undoubtedly a driving factor for the tunability of optical and electrical properties in semiconducting or metallic materials. However, influencing the fundamental properties is still challenging and requires sophisticated surface or dimensionality manipulation. In this work, we present such a modification for the example of colloidal lead sulphide nanowires. We show that the electrical properties of lead sulphide nanostructures can be altered from semiconducting to metallic with indications of superconductivity, by exploiting the flexibility of the colloidal synthesis to sculpt the crystal and to form different surface facets. A particular morphology of lead sulphide nanowires has been synthesized through the formation of {111} surface facets, which shows metallic and superconducting properties in contrast to other forms of this semiconducting crystal, which contain other surface facets ({100} and {110}). This effect, which has been investigated with several experimental and theoretical approaches, is attributed to the presence of lead rich {111} facets. The insights promote new strategies for tuning the properties of crystals as well as new applications for lead sulphide nanostructures.

23 pages, 6 figures

References in corpus (17)

• Separable Dual Space Gaussian Pseudo-potentials
• Relativistic separable dual-space Gaussian Pseudopotentials from H to Rn
• Ultra-thin PbS sheets by two-dimensional oriented attachment
• Temperature dependence of the resistance of metallic nanowires (diameter $\ge$ 15 nm): Applicability of Bloch-Grüneisen theorem
• Metallic ground state in an ion-gated two-dimensional superconductor
• Macroscopic Superconducting Current through a Silicon Surface Reconstruction with Indium Adatoms: Si(111)-(R7$\times$R3)-In
• Remarkable effects of disorder on superconductivity of single atomic layers of lead on silicon
• Field-effect transistors assembled from functionalized carbon nanotubes
• p-wave triggered superconductivity in single layer graphene on an electron-doped oxide superconductor
• Quantum size effects on the perpendicular upper critical field in ultra-thin lead films
• Field-effect transistors made of individual colloidal PbS nanosheets
• Towards colloidal spintronics through Rashba spin-orbit interaction in lead sulphide nanosheets
• Photovoltaic effect in individual asymmetrically contacted lead sulfide nanosheets
• From dots to stripes to sheets - Shape control of lead sulfide nanostructures
• Superconductivity in single crystalline Pb nanowires contacted by normal metal electrodes
• Sculpting of lead sulfide nanoparticles by means of acetic acid and dichloroethane
• High Performance n- and p-Type Field-Effect Transistors Based on Hybridly Surface-Passivated Colloidal PbS Nanosheets