Abstract
Nanowire (NW) and other one-dimensional (1-D) nanomaterials have found many applications in electronics, photonics, chemical and biological sensing, and renewable energy applications. The fundamental understanding of their rational growth is critical important to their applications. I will discuss a “new” nanowire formation mechanism that is different from the well-known metal catalyzed vapor-liquid-solid (VLS) mechanism. Axial screw dislocations provide the self-perpetuating steps to enable 1-dimensional crystal growth, unlike previously understood mechanisms that require metal catalysts. This mechanism was first found in hierarchical nanostructures of lead sulfide (PbS) nanowires resembling “pine trees” that were synthesized via chemical vapor deposition.
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