使用一鍋化多元醇法與有機金屬裂解法技術結合，將多壁奈米碳管/三氧化鎢(MWCNTs / WO3)以及還原型氧化石墨烯/三氧化鎢(RGO / WO3)奈米複合材料薄膜製備於氧化鋁基板上方，為室溫下使用的PPb級二氧化硫(SO2)氣體感測器。對比氣體感測結果顯示，與MWCNTs / WO3奈米複合材料薄膜和原始WO3材料薄膜相比，由RGO / WO3奈米複合材料薄膜製成的SO2氣體感測器具有最高的感度，其在室溫下可檢測到非常低濃度(ppb級)的SO2氣體。RGO / WO3奈米複合材料薄膜的SO2氣體感測器具有更快的反應和恢復時間，可重複性以及最低偵測極限。在與SO2氣體相互作用時，有摻雜MWCNTs和RGO會與WO3異質界面上形成新的傳導途徑和空乏層是造成反應增強的原因。
ppb-level SO2 gas sensors for use at room temperature were fabricated using an in situ one-pot polyol method combined with metal organic decomposition (MOD) of nanocomposite films of multi-walled carbon nanotubes/WO3 (MWCNTs/WO3) and reduced graphene oxide/WO3 (RGO/WO3) on an alumina substrate. Comparative gas sensing results showed that the SO2 gas sensor based on the RGO/WO3 nanocomposite film exhibited a higher response compared with the MWCNTs/WO3 nanocomposite film and pristine WO3 film, sensing SO2 gas at very low (ppb-level) concentrations at room temperature. The SO2 gas sensor based on the RGO/WO3 nanocomposite film also had fast response and recovery times, good reproducibility, and the lowest detection limit. The formation of new conducting pathways and the spread of the depletion layers at the interface of the doped MWCNTs or RGO and the WO3 matrix upon interaction with SO2 gas were responsible for the enhanced response.
