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The combinations of hollow MoS 2 micro@nano-spheres were successfully fabricated through a one-step hydrothermal method. A possible growth mechanism was presented in detail based on time-dependent experimental facts. Besides, the photocatalytic activities of the samples were evaluated by monitoring the photodegradation of methylene blue (MB). The adsorption value of 150 mg g À1 shows a strong adsorption capability in the dark. After irradiation for only 30 min, the remaining MB in solution is about 9.7%. Moreover, the humidity sensing properties of the samples were measured for the first time. The results revealed high sensitivity at high RH, small humidity hysteresis, fast response and recovery times, and good stability. The greatest sensitivity is 32.19 nF/% RH and the maximum hysteresis is $6.3% RH.For humidity cycling of 17.2-89.5-17.2% RH, the response and recovery times are $140 s and $80 s, respectively. Capacitance fluctuations for one month are less than AE7% at various relative humidities (RHs).