Chemical sensing systems using xerogel-based sensor elements and CMOS photodetectors
Chemical sensing systems using xerogel-based sensor elements and CMOS photodetectors
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DOI：
10.1109/jsen.2004.823684
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发表时间：
2004-04-01
影响因子：
4.3
通讯作者：
Bright, FV
中科院分区：
文献类型：
--
作者：
Davenport, M;Titus, AH;Bright, FV
我们提出的第一个例子的集成互补金属氧化物半导体（CMOS）光电探测器耦合的固态干凝胶为基础的薄膜传感器，以产生一个紧凑的化学传感器系统。我们比较使用两种不同的CMOS为基础的检测器系统，通过使用标准的光电倍增管（PMT）或电荷耦合器件（CCD）检测器获得的结果。由于化学传感器元件由Stern-Volmer关系控制，因此Stern-Volmer猝灭常数用作不同检测器之间的主要比较器。所有体系的Stern-Volmer常数在0.042 ~ 0.049 O-2%（-1）之间。结果表明，CMOS检测器系统产生的分析数据是可比的CCD和PMT为基础的系统。从每个检测器获得的数据之间的差异主要与每个检测器如何获得当前存在的信号的差异相关联。我们还观察到令人满意的可逆性的传感器系统的操作。基于CMOS的系统的响应时间比化学传感器元件的固有响应时间更快，这使得CMOS适合于时间相关的测量。与标准PMT或CCD相比，CMOS阵列探测器的功耗还不到0.1%。组合干凝胶/CMOS系统是朝着便携式、高效传感器系统的发展迈出的重要一步。
We present the first example of an integrated complementary metal-oxide-semiconductor (CMOS) photodetector coupled with a solid-state xerogel-based thin-film sensor to produce a compact chemical sensor system. We compare results using two different CMOS-based detector systems to results obtained by using a standard photomultiplier tube (PMT) or charge-coupled device (CCD) detector. Because the chemical sensor elements are governed by a Stern-Volmer relationship, the Stern-Volmer quenching constant is used as the primary comparator between the different detectors. All of the systems yielded Stern-Volmer constants from 0.042 to 0.049 O-2 % (-1). The results show that the CMOS detector system yields analytical data that are comparable to the CCD- and PMT-based systems. The disparity between the data obtained from each detector is primarily associated with the difference in how the signals are obtained by each detector as they presently exist. We have also observed satisfactory reversibility in the operation of the sensor system. The CMOS-based system exhibits a response time that is faster than the chemical sensor element's intrinsic response time, making the CMOS suitable for time-dependent measurements. The CMOS array detector also uses less than 0.1% the power in comparison to a standard PMT or CCD. The combined xerogel/CMOS system represents an important step toward the development of a portable, efficient sensor system.