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Pure and Cu doped SnO2 nanowires and nanobelts were grown in a tubular furnace under argon atmosphere at ambient pressure. X-ray diffraction showed that Cu gets incorporated into the SnO2 lattice. Isolated single nanowire sensors have been fabricated for detection of H2S gas at room temperature. Cu doping was found to reduce the sensitivity of these sensors in contrast to results reported for Cu doped SnO2 thin films. Photoluminescence studies indicate that the reduction is sensitivity may be due to reduced defect density. [ABSTRACT FROM AUTHOR]