In this work, a ɤ-MnO₂ flower-like nanostructure was synthesized. The structural and morphological characterization of ɤ-MnO₂ flower-like nanostructure was performed by X-ray powder diffraction (XRD), N₂–sorption studies (Brunauer–Emmett–Teller surface area measurements) (BET), particle size distribution (PSA), energy dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM). The ammonia gas sensor was fabricated based on the high surface area of ɤ-MnO₂ flower-like nanostructure. According to the results, tetragonal tunnels were advantageous for trapping and adsorption-desorption of NH₃ gas molecules. The results indicated that the gas sensor based on ɤ-MnO₂ flower-like nanostructure had high sensitivity (40% response to 100 mg L⁻¹ NH₃ gas), selectivity, detectability up to 2 mg L⁻¹ NH₃ gas, long-term stability, and repeatability for two months at room temperature. Of the study also examined the effect of compounds such as ethanol, acetone, hydrazine, n-heptane, monomethylamine (MMA), triethylamine (TEA) and trimethylamine (TMA) on the detection of ammonia gas.

在这项工作中，ɤ-的MnO ₂花状纳米结构的合成。X -MnO ₂花状纳米结构的结构和形态表征是通过X射线粉末衍射（XRD），N _2-吸附研究（Brunauer-Emmett-Teller表面积测量）（BET），粒度分布（PSA）进行的），能量色散X射线光谱仪（EDS）和扫描电子显微镜（SEM）。基于ɤ-的MnO的高表面积的氨气传感器制作₂花状纳米结构。根据该结果，四方隧道有利于NH ₃气体分子的捕集和吸附-解吸。结果表明，基于ɤ-MnO的气体传感器₂花状纳米结构具有高灵敏度（对100 mg L ^-1 NH ₃气体有40％的响应），选择性，高达2 mg L ^-1 NH ₃气体的可检测性，长期稳定性以及在室温下两个月的可重复性。研究中还检查了乙醇，丙酮，肼，正庚烷，单甲胺（MMA），三乙胺（TEA）和三甲胺（TMA）等化合物对氨气检测的影响。