Comparison of adsorbent films obtained by plasma polymerization of oxygenated organic compounds

被引:7
作者
Lima, R. R. [4 ]
Hemandez, L. F. [1 ]
Fachini, E. [2 ]
Demarquette, N. R. [3 ]
Silva, M. L. P. [1 ,3 ]
机构
[1] Fac Technol Sao Paulo, Sao Paulo, Brazil
[2] Univ Puerto Rico, Rio Piedras, Brazil
[3] Univ Sao Paulo, Polytech Sch, BR-05508 Sao Paulo, Brazil
[4] Univ Sao Paulo, Inst Phys, BR-05508 Sao Paulo, Brazil
基金
巴西圣保罗研究基金会;
关键词
mu-TAS development; plasma polymerization; adsorbent organic thin films; alcohol; aldehyde and esters;
D O I
10.1016/j.snb.2007.07.135
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Thin films obtained by plasma polymerization of ethyl ether, methyl or ethyl acetate, acetaldehyde, acetone and 2-propanol were compared. Infrared spectroscopy (FFIR), resistance to chemicals, contact angle measurements, X-ray photoelectron spectroscopy (XPS), optical and scanning electron microscopy (SEM), and quartz crystal microbalance (QCM) were carried out. For all films FTIR showed high intensity for polar bonds yet the films are not resistant to polar solvents. Contact angle measurements revealed hydrophilic and organophilic surfaces and XPS pointed out a high proportion of oxygenated bonds. All films showed good step coverage and peeling was significant only with acetone and 2-propanol. All films are adsorbent for organic compounds in a large scale of polarity but acetaldehyde and 2-propanol act like a selective membrane. Also, deposition of these films on hydrophobic substrates leads to island formation. A possible model to explain the results must consider the hydrogen bridge formation on 2-propanol and acetaldehyde films. Ethyl ether, ethyl and methyl acetate showed good characteristics for development of sensor and sample pretreatment using miniaturized devices. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:110 / 119
页数:10
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