| 查看: 1433 | 回复: 4 | |||
| 本帖产生 1 个 翻译EPI ，点击这里进行查看 | |||
[交流]
急求翻译一段话
|
|||
|
The In2O3 based sensor shows different sensing responses towards various gases. The different diffusivities and reactivity of these gases would be the key factors influencing this issue [28]. The gas transport without external pressure can be described by Knudsen diffusion. According the corresponding model, gas transport occurs mainly by molecular diffusion in macropores (with diameter > 25nm), while surface diffusion becomes predominant in micropores (with diameter < 1 nm). In fact, our In2O3-based sensor contains two kind pores: the pore in the In2O3 nanoplatelets (with diameter 2-4 nm), and the larger pores (gaps) between adjacent In2O3 nanoplatelets (with diameter >>25 nm from the observation of SEM image (Fig. 4a)). It is believed that the gas transport in our In2O3 sensor occurs mainly by molecular diffusion. This indicates the analytes may be able to diffuse similar depth into the In2O3 sensing layer. Therefore, the different diffusivities of the analytes in our sensor would slightly contribute to the sensing response. On the other hand, the reactivity of these analytes would be responsible for the obtained sequence of sensing response. From the ionosorption model [29] of oxide semiconductor gas sensor, reducing gases abstract surface-bound oxygen which immobilized the conduction electron, thereby release immobilized electron into the crystal and induce the change of the conductivity of the sensor. These analytes have different ability to abstract surface-bound oxygen, and so showing different sensing response. In addition, the different reaction kinetics of these analytes may be another factor resulting in the different sensing response. We believe that the compositive influence of these aspects of the analytes induces the consequence of the sensing responses. The gas sensing superiority of our prepared porous In2O3 nanoplatelets is easily understood. From the theoretical simulation and experimental results, the sensor response could remarkably increase as the average crystallite size decreased to below 20 nm, which is about twice the thickness of electron depletion layer [30-33]. The thickness of our prepared In2O3 nanoplatelets is below 6 nm, which is much thinner than twice the thickness of electron depletion layer. That is obviously beneficial to the enhancement of sensing performance. Secondly, our prepared In2O3 nanoplatelets are of single crystalline and porous feature. The carrier transport is easy in the single crystalline structure. It is believed that not only the electrons are easily depleted but also the sensor has higher stability owing to the high crystallinity of the sensing materials. Furthermore, bigger accessible surface together with convenient transport of gas can be benefited from the porous structure [28]. Comparatively, the commercial In2O3 with bigger size has much lower sensitivity. Thirdly, the unique 2-D nanostructures are stable [34-36]. They are effective in mitigating the strong agglomeration between nanoplatelets. As revealed by the reported sensing mechanism, the resistance of the sensing film is controlled by the internanocrystal barrier at the contacts, and the sensitivity results mainly from the barrier modulation at the contacts by gas [37]. A distinct characteristic of the sensing film composed of In2O3 nanoplatelets is that most of the contacts between them are face-face contacts, which has large contact area with most of them contributing to the sensing. This is in contrast to other structure such as nanospheres or nanowires [38]. In addition, our prepared In2O3 nanoplatelets are bound by {110} planes with higher energy, which would have higher gas adsorption and reactivity [4, 19, 20]. Therefore, the In2O3 nanoplatelets possess a good sensing performance and would be promising candidates for fabricating high performance gas sensors. |
回复此楼» 猜你喜欢
学硕274求调剂
已经有11人回复
-
一志愿郑大材料工程290求调剂
已经有12人回复
-
环境工程 085701，267求调剂
已经有8人回复
-
083000学硕274求调剂
已经有10人回复
-
一志愿085600中科院宁波所276分求调剂
已经有4人回复
-
材料专业申博
已经有3人回复
-
307求调剂
已经有20人回复
-
285求调剂
已经有8人回复
-
材料与化工（0856）304求B区调剂
已经有8人回复
-
370求调剂
已经有3人回复
» 抢金币啦！回帖就可以得到:
-
齐齐哈尔大学材料科学与工程学院 诚招调剂生
+1/988
-
烟台大学环境与材料工程学院2026年硕士研究生招生
+1/48
-
坐标广州，征女友
+2/40
-
新疆碳纳米材料制备与应用重点实验室2026年招聘启事
+1/39
-
球差相关知识
+1/37
-
【分享】招收08工学硕士（要求过国家线）
+1/34
-
2023年南京林业大学（双一流学科建设高校）化工学院招生化工方向调剂生
+1/32
-
福建师范大学环境与资源学院环境电化学课题组招收2026硕士（调剂，4月8号线上面试）
+1/29
-
上海大学 “生物有机电子材料及器件”团队硕士、博士研究生招聘
+1/27
-
济南大学水利与环境学院赵艳侠教授简介
+1/20
-
【轻松准入】【生物医药】2026青岛大学招博士生
+1/19
-
汕头大学海洋与生命学科李升康教授团队招收生物类调剂生
+1/16
-
招收2026专业代码08开头学术型硕士研究生
+1/11
-
课题组招收专业代码08开头的学硕！
+1/8
-
招生材料与化工、环境科学调剂研究生
+1/5
-
上海交通大学陈倩栎课题组招收2026年申请-考核博士生1名（能源材料方向）
+1/3
-
调剂来这边
+1/3
-
招收2026级研究生
+1/2
-
香港中文大学（深圳）生物智能制造方向招生-高分子功能材料、智能/仿生材料、生物材料
+1/2
-
2026年北京石油化工学院环境学科-水污染控制工程方向课题组欢迎您
+1/2
2楼2011-03-31 17:13:45
3楼2011-04-01 09:24:11
4楼2011-04-01 09:44:28
雪夕(金币+20, 翻译EPI+1): 2011-04-05 10:43:15
|
面对各种气体，氧化铟传感器的传感响应表现均不一样。这些气体的不同的扩散率和反应活性本文的影响都有着重要影响[28]。Knudsen扩散描述了，气体运输不需要外力就可以进行。根据相应的模型、气体运输的发生是通过大孔隙（ 直径>25nm）的分子扩散,而表面扩散主要通过微孔的方式扩散(直径< 1纳米)。事实上,我们的氧化铟传感器包含两种气孔:孔隙直径如氧化铟纳米级(2-4纳米),和更大的气孔(空白)相邻氧化铟纳米级 (直径> >25纳米 从观测的扫描电镜照片得出(图4)）。此举被认为在我们的氧化铟传感器的气体运输主要是分子扩散的形式。这表明这一过程可以扩散到类似的深度氧化铟感应层。因此,不同的样本扩散率传感器会稍微有助于传感响应。 另一方面,这些样本的反应性将负责在获得传感响应序列。从ionosorption模型(29)的氧化物半导体气敏传感器得知,减少气体中表面范围上提取的氧气,能固定化传导电子,从而释放固定电子进入入晶体和导致电导率传感器的改变。这些样品有不同的能力提取表面范围上的氧气,所以表达不同传感响应。此外,不同的反应动力学的这些样品可能成为另一个因素导致不同的传感响应。我们相信,样品各方面的综合的影响最终导致传感反应的最终结果。 我们准备好的有气孔的纳米级氧化铟的气体传感优势比较通俗易懂。从理论模拟和实验结果表明,该传感器响应可显著的增加。 |
5楼2011-04-03 18:13:46
