The present disclosure provides systems, processes, articles of manufacture, and compositions that relate to core/shell semiconductor nanowires. Specifically, the disclosure provides a novel semiconductor material, CdSe/ZnS core/shell nanowires, as well as a method of preparation thereof. The disclosure also provides a new continuous flow method of preparing core/shell nanowires, including CdSe/CdS core/shell nanowire and CdSe/ZnS core/shell nanowires.