The method of fabricating semiconducting nanowires having a desired wire diameter includes providing pre-fabricated semiconducting nanowires, at least one pre-fabricated nanowire having a wire diameter larger than the desired wire diameter ; and reducing the wire diameter of the at least one pre-fabricated nanowire by etching. The slide assembly includes a card holding slider that includes a sheet metal plate that lies under the card, and a retention bar at the rear end of the plate that abuts the rear edge of the card. The gas purification chamber has a crude gas inlet, a pure gas outlet, and an oil outlet. The brightness can be set by altering the power output of the first and the second power supplies at the same time. The method of the present invention can be implemented in a computer program product or distributed software adapted to be loaded into at least one or a plurality of memory locations and executed by at least one or a plurality of respective computer processors.