Rapid and accurate detection of toxic and harmful gases in the environment is an important means to prevent poisoning and leakage accidents. A tapered microfiber interferometer coated by WO₃ nanorods for gas sensing is fabricated by using flame melting biconical taper method. As a coated material for the microfiber interferometer (MFI) ammonia gas sensor, the WO₃ nanorods are made by hydrothermal method, and are dripped onto the surface of the sensor. The WO₃ nanorods coating on the sensor surface can absorb ammonia molecules and generate charge transfer, which results in the shift of transmission spectrum. The experimental results show that the prepared sensor has high sensitivity and selectivity to ammonia gas. When the ammonia gas concentration is from 0 to 11640 ppm, the spectrum shift of the WO₃ nanorods coated sensor is 16.23 nm. The sensor has good repeatability, selectivity and wide application prospects in the monitor of harmful gases.

快速准确地检测环境中的有毒有害气体是防止中毒和泄漏事故的重要手段。采用火焰熔融双锥锥度法制备了由WO ₃纳米棒包覆的用于气体传感的锥形微纤维干涉仪。WO ₃纳米棒作为超细纤维干涉仪（MFI）氨气传感器的涂层材料，通过水热法制成，并滴在传感器的表面上。WO ₃传感器表面的纳米棒涂层可以吸收氨分子并产生电荷转移，从而导致透射光谱发生偏移。实验结果表明，所制备的传感器对氨气具有较高的灵敏度和选择性。当氨气浓度为0至11640 ppm时，WO ₃纳米棒涂覆的传感器的光谱偏移为16.23 nm。该传感器具有良好的重复性，选择性和在有害气体监测仪中的广阔应用前景。