tailieunhanh - Báo cáo hóa học: " A novel gas ionization sensor using Pd nanoparticle-capped ZnO"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : A novel gas ionization sensor using Pd nanoparticle-capped ZnO | Wang et al. Nanoscale Research Letters 2011 6 534 http content 6 1 534 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access A novel gas ionization sensor using Pd nanoparticle-capped ZnO Hongjun Wang1 Changwei Zou2 Canxin Tian1 Lin Zhou1 Zesong Wang1 and Dejun Fu1 3 Abstract A novel gas ionization sensor using Pd nanoparticle-capped ZnO Pd ZnO nanorods as the anode is proposed. The Pd ZnO nanorod-based sensors compared with the bare ZnO nanorod show lower breakdown voltage for the detected gases with good sensitivity and selectivity. Moreover the sensors exhibit stable performance after more than 200 tests for both inert and active gases. The simple low-cost Pd ZnO nanorod-based field-ionization gas sensors presented in this study have potential applications in the field of gas sensor devices. 1. Introduction Gas sensors have attracted considerable attention in recent years because of their huge potential applications such as pollution detection environment protection gas detection for counter-terrorism etc. 1 . There are two types of gas sensors chemical type operated by gas adsorption-desorption and physical type operated by field ionization. In different gas varies and concentrations atmosphere the chemical type gas sensor can detect the modifications of the electronic properties in the active layer such as carbon nanotubes CNTs 2-4 porous silicon 5 and metal oxides 6 . However the application of the chemical type gas sensor is limited by several disadvantages such as the potential difficulties in detecting gases with low adsorption energies the high working temperature except for the CNTs based sensors and the higher power consumption. Recent efforts have been directed to the physical type of gas senor based on the field ionization which works by fingerprinting the ionization characteristics of distinct gases. This type sensor can detect gases regardless of their adsorption energies. A novel physical gas sensor .