Classification and characterization of atmospheric VOCs based on sorption/desorption behaviors of plasma polymer films

Abstract The effects of adsorbed/absorbed (sorbed) water on the sensor response of a quartz crystal resonator (QCR) coated with plasma polymer films (PPFs) were investigated. Conventionally, the performance of QCR sensors for volatile organic compounds (VOC) has generally been measured under ideal conditions using dry synthetic air as a dilution or carrier gas. On the assumption of use for real indoor-air monitoring, a gas-flow setup is developed for assessing the sensor capability of PPF-coated QCRs in terms of a VOC plume generated from cellulose beads incorporating a VOC under normal atmospheric conditions. Sensor response patterns are classified into three types, and the water sorbed on the PPFs before chemical exposure is considered to play a significant role. We have presented an explanatory model describing sorption/desorption behavior based on the hydrophilic/hydrophobic interactions between VOCs, sorbed water, and PPFs. PPF weight loss is induced by desorption of the sorbed water, owing to the reduction of affinity to the PPF. Principal component analysis (PCA) has revealed that the VOCs in atmospheric air can generally be classified in terms of their polarity and carbon chain length, by using the strength and width of the sensor response curves towards the pulse-like exposure of the VOC plume.

[1]  I. Sugimoto,et al.  Aroma sensing and indoor air monitoring by quartz crystal resonators with sensory films prepared by sputtering of biomaterials and sintered polymers. , 2004, Biosensors & bioelectronics.

[2]  J. Goschnick,et al.  Air quality monitoring and fire detection with the Karlsruhe electronic micronose KAMINA , 2002 .

[3]  Takashi Oyabu,et al.  Odor sensing characteristics of a lavatory in a general domicile , 2001 .

[4]  I. Sugimoto,et al.  Structures and VOC-sensing performance of high-sensitivity plasma-polymer films coated on quartz crystal resonator , 1999 .

[5]  A. Hodgson.  A Review and a Limited Comparison of Methods for Measuring Total Volatile Organic Compounds in Indoor Air , 1995 .

[6]  Michael H. Abraham,et al.  Scales of solute hydrogen-bonding: their construction and application to physicochemical and biochemical processes , 2010 .

[7]  N. Kasai,et al.  Odorant detection capability of QCR sensors coated with plasma deposited organic films. , 1999, Biosensors & bioelectronics.

[8]  Determination of solvents permeating through chemical protective clothing with a microsensor array. , 2000, Journal of environmental monitoring : JEM.

[9]  K. Cammann.  Sensors and analytical chemistry , 2003 .

[10]  Michael H. Abraham,et al.  Thermodynamics of solute transfer from water to hexadecane , 1990 .

[11]  Eugenio Martinelli,et al.  Counteraction of environmental disturbances of electronic nose data by independent component analysis , 2002 .

[12]  Iwao Sugimoto,et al.  Application of an array sensor based on plasma-deposited organic film coated quartz crystal resonators to monitoring indoor volatile compounds , 2002 .

[13]  Peter Politzer,et al.  Quantitative treatments of solute/solvent interactions , 1994 .

[14]  N. Kasai,et al.  Gas-sorption effects on plasma polymer films characterized by XPS and quartz crystal resonator , 2000 .

[15]  I. Sugimoto,et al.  Detection of petroleum hydrocarbons at low ppb levels using quartz resonator sensors and instrumentation of a smart environmental monitoring system. , 1999, Journal of environmental monitoring : JEM.

[16]  Gian Carlo Cardinali,et al.  An electronic nose based on solid state sensor arrays for low-cost indoor air quality monitoring applications , 2004 .

[17]  H. Yasuda,et al.  A study of surface dynamics of polymers. II. Investigation by plasma surface implantation of fluorine–containing moieties , 1988 .

[18]  R. C. Weast.  CRC Handbook of Chemistry and Physics , 1973 .

[19]  H. Yasuda,et al.  Effect of orientation and mobility of polymer molecules at surfaces on contact angle and its hysteresis , 1981 .

[20]  Iwao Sugimoto,et al.  Petroleum pollution sensing at ppb level using quartz crystal resonators sputtered with porous polyethylene under photo-excitation , 2000 .

[21]  Iwao Sugimoto.  Organic vapor detection using quartz crystal sensors coated by sputtering of porous sintered-polymer targets , 1998 .

[22]  J. Grate,et al.  Solubility interactions and the design of chemically selective sorbent coatings for chemical sensors and arrays , 1991 .

[23]  R. A. McGill,et al.  Determination of olive oil–gas and hexadecane–gas partition coefficients, and calculation of the corresponding olive oil–water and hexadecane–water partition coefficients , 1987 .

[24]  M. Odlyha,et al.  Microclimate monitoring of indoor environments using piezoelectric quartz crystal humidity sensors. , 2000, Journal of environmental monitoring : JEM.