Benzene gas detection using a MOSFET-BJT hybrid mode operated gated lateral BJT

A benzene gas sensor was developed base on the gated lateral bipolar junction transistor (BJT) coupled with solvatochromic dye in this study. The gated lateral BJT which combined a metal-oxide-semiconductor field effect transistor (MOSFET) and a BJT was used as the main part of the device. The 4-amino-N-methylphthalimide (4-ANMP) dye as a kind of solvatochromic dye with charge-transfer (CT) characteristic was fabricated on the surface of the device as the sensing membrane. Benzene gas as the sensing target in this study and the results shows that the proposed device can be used for benzene gas detection successful.

INTRODUCTION

Benzene is a kind of volatile organic compound (VOC) which has much been used as an intermediate to make other chemicals. Benzene is a notorious cause of bone marrow failure not only in the liquid state but also in the gas state. Therefore, many researchers laid the focus on benzene gas detection [1]. The most difficulty of the benzene gas detection is that the benzene has no polarity. Therefore, the most research detects the benzene gas using swallowing phenomenon [2]. Consequently, in order to obtain the recovery characteristics, high temperature operation condition is necessary.