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| For an n-type oxide semiconductor, intrinsic oxygen vacancies are responsible for its electronic conductivity. The adsorption of oxidative gas species will creates extrinsic surface acceptor states that repel conduction band electrons, which results in lower conductivity, while reductive gas will cause reverse result. Therefore, the gases can be detected through monitoring the change of electronic conduction. Most of the present effort is being contributed to the improvement of sensitivity, selectivity, and long term stability of gas sensors. For a high sensitivity (i.e. great change in conductivity) and a fast response rate, the sensing material should exhibit large surface areas, and allow for good accessibility of the sensing material surface. To fulfill these requirements for gas sensors, one method is to decrease the size of sensor material, or to prepare porous structure for increasing the surface-to-volume ratio. Another route is to design and synthesize the nanostructure of sensing material exposing unique lattice planes [4], which would have stronger or selective absorption ability for detecting gases. |
» 搶金幣啦!回帖就可以得到:
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木蟲 (著名寫手)
| 一個(gè)n型氧化物半導(dǎo)體,內(nèi)在氧氣導(dǎo)致其指定的電子電導(dǎo)。摘要利用氧化氣體物種將會(huì)創(chuàng)造外在表面受體狀態(tài),電子,使導(dǎo)帶排斥電導(dǎo)率處于較低,而還原氣體會(huì)導(dǎo)致相反的結(jié)果。因此,毒氣可以通過監(jiān)測(cè)的變化檢測(cè)電子導(dǎo)電。大多數(shù)的現(xiàn)狀,分析了正在努力改善靈敏度、選擇性、和長期穩(wěn)定的氣體傳感器。高敏感性(即巨大變化的快速反應(yīng)和導(dǎo)電率、傳感資料應(yīng)當(dāng)顯示大的表面積,讓良好的可訪問性的感應(yīng)材料表面。達(dá)到這些要求,氣體傳感器,提出一種確定的大小是降低傳感器材料,或準(zhǔn)備的孔隙結(jié)構(gòu)提高surface-to-volume比率。另一條路是設(shè)計(jì)和合成納米傳感材料暴露獨(dú)特的晶格層[4],這將有較強(qiáng)的或選擇性吸收能力檢測(cè)的氣體。 |
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對(duì)于n型氧化物半導(dǎo)體,其固有氧空穴影響著材料導(dǎo)電率。吸收氧化性氣體會(huì)產(chǎn)生非本征的表面受體狀態(tài)并排斥導(dǎo)帶電子,從而引起導(dǎo)電率下降。而還原性氣體影響與此相反。因此,可以通過監(jiān)測(cè)導(dǎo)電率的變化檢測(cè)氣體。當(dāng)前大多數(shù)研究在于提升氣體傳感器的靈敏度,選擇性和穩(wěn)定性。要實(shí)現(xiàn)高的靈敏度(即大的導(dǎo)電率變化)和快速響應(yīng),感應(yīng)材料必須有大的接觸面,并且易于和被偵測(cè)氣體接觸。為了實(shí)現(xiàn)氣體傳感器上述要求,一是要減小感應(yīng)材料的體積,或者采用多孔結(jié)構(gòu)以提高表面積與體積比。二是制造具有特定晶面的納米結(jié)構(gòu)感應(yīng)材料,以得到更強(qiáng)的或選擇性的氣體吸收。 這mm掛了問題就一周不上線,不會(huì)是水貼吧? |
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