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Why do zinc oxide nanowires grow horizontally rather than vertically? 


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Zinc oxide nanowires can grow horizontally rather than vertically due to the influence of electric fields exerted by the insulating substrate and the surface charge present on semiconductors and insulators . These electric fields can be manipulated to define the orientation and polarity of the nanowires, resulting in horizontal growth . Additionally, the anisotropic crystal nature of zinc oxide, with a preferred orientation along the c-axis in the (001) direction, can contribute to the horizontal growth of nanowires . Furthermore, approaches utilizing centrifugal forces have been developed to artificially order zinc oxide nanowires at the substrate periphery, leading to directional self-assembly and potentially horizontal growth . Overall, the growth of zinc oxide nanowires is influenced by various factors, including electric fields, surface charge, crystal structure, and external forces, which can result in horizontal rather than vertical growth.

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The provided paper does not provide information on why zinc oxide nanowires grow horizontally rather than vertically.
The provided paper does not discuss why zinc oxide nanowires grow horizontally rather than vertically. The paper specifically focuses on the growth mechanism of vertically-aligned nanowires in the absence of epitaxy.
The provided paper does not mention why zinc oxide nanowires grow horizontally rather than vertically.
The provided paper does not provide information about why zinc oxide nanowires grow horizontally rather than vertically.
The provided paper does not discuss why zinc oxide nanowires grow horizontally rather than vertically. The paper focuses on the physics underlying the vertical alignment of nanowires in the absence of epitaxy.

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