钯掺杂对SnO_2纳米纤维气体传感器的线性化改性

Pd-doped SnO_2 Nanofibers Linea rized Modification of Gas Sensor

采用静电纺丝法制备了钯掺杂的SnO_2纳米纤维,通过X射线衍射仪(XRD)、扫描电镜(SEM)、X射线能谱仪(EDS)对其进行了物相分析、形貌观察和表面元素分布分析。钯掺杂SnO_2纤维粉体仍为四方相金红石结构,结晶度有所下降,晶粒减小。将此纤维粉体涂布于带加热丝的陶瓷管制成气体传感元件并在气相色谱仪上进行了流动态气敏性能测试。该传感器对变压器油中溶解故障特征气体的灵敏度降低,但是除H_2外线性响应范围明显增加。

Palladium doped SnO2 nanofibers were prepared by electrospinning method and phase analysis, morphology observation and surface elemental distribution were conducted by X ray diffraction （XRD）, Scanning Electron Microscope （SEM） and Energy Dispersive Spectrometer （EDS） respectively. Pd-doped SnO2 fiber powder is still in tetragonal rutile structure with decreased crystallinity and grain size. The fiber powder is coated on a ceramic tube with heating wire to form a gas sensing element and its fluidic gas sensing performance were tested on gas chromatograph. The sensitivity of the sensor for gases dissolved in transformer oil was reduced, but the linear response range of the sensor is significantly increased except for H2.