TITLE

Combined optical and acoustical method for determination of thickness and porosity of transparent organic layers below the ultra-thin film limit

AUTHOR(S)
Rodenhausen, K. B.; Kasputis, T.; Pannier, A. K.; Gerasimov, J. Y.; Lai, R. Y.; Solinsky, M.; Tiwald, T. E.; Wang, H.; Sarkar, A.; Hofmann, T.; Ianno, N.; Schubert, M.
PUB. DATE
October 2011
SOURCE
Review of Scientific Instruments;Oct2011, Vol. 82 Issue 10, p103111
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Analysis techniques are needed to determine the quantity and structure of materials composing an organic layer that is below an ultra-thin film limit and in a liquid environment. Neither optical nor acoustical techniques can independently distinguish between thickness and porosity of ultra-thin films due to parameter correlation. A combined optical and acoustical approach yields sufficient information to determine both thickness and porosity. We describe application of the combinatorial approach to measure single or multiple organic layers when the total layer thickness is small compared to the wavelength of the probing light. The instrumental setup allows for simultaneous in situ spectroscopic ellipsometry and quartz crystal microbalance dynamic measurements, and it is combined with a multiple-inlet fluid control system for different liquid solutions to be introduced during experiments. A virtual separation approach is implemented into our analysis scheme, differentiated by whether or not the organic adsorbate and liquid ambient densities are equal. The analysis scheme requires that the film be assumed transparent and rigid (non-viscoelastic). We present and discuss applications of our approach to studies of organic surfactant adsorption, self-assembled monolayer chemisorption, and multiple-layer target DNA sensor preparation and performance testing.
ACCESSION #
66903084

 

Related Articles

  • Compensation of temperature effects in quartz crystal microbalance measurements. Rahtu, Antti; Ritala, Mikko // Applied Physics Letters;1/21/2002, Vol. 80 Issue 3, p521 

    Quartz crystal microbalance (QCM) is a very powerful method for in situ monitoring of thin film growth processes. However, especially at high temperatures, QCM is very sensitive to already minor temperature changes during the measurement. Here, a method for compensating the temperature effects...

  • Quartz crystal microbalance thin-film dissolution rate monitor. Hinsberg, William D.; Kanazawa, Kay K. // Review of Scientific Instruments;Mar89, Vol. 60 Issue 3, p489 

    We describe the details of construction and operation of an instrument useful for the characterization of dissolution kinetics of thin films. This device, based on a quartz crystal microbalance operating in contact with a liquid, avoids the limitations associated with the use of optical,...

  • Quartz microbalance device for transfer into ultrahigh vacuum systems. Stavale, F.; Niehus, H.; Achete, C. A. // Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p105102 

    An uncomplicated quartz microbalance device has been developed which is transferable into ultrahigh vacuum (UHV) systems. The device is extremely useful for flux calibration of different kinds of material evaporators. Mounted on a commercial specimen holder, the device allows fast quartz...

  • Using a quartz crystal microbalance to probe formation of Xe hydrate in thin ice films. Chan, J.; Forrest, J. A.; Torrie, B. H. // Journal of Applied Physics;9/1/2004, Vol. 96 Issue 5, p2980 

    We have demonstrated the ability of the quartz crystal microbalance to successfully measure the formation and dissociation of thin films of Xe hydrate formed from ice films in the presence of Xe gas or from a cooled mixture of water vapor and Xe gas. By monitoring the uptake of mass, we have...

  • High-stability quartz-crystal microbalance for investigations in surface science. Bouzidi, L.; Narine, S. S.; Stefanov, K. G.; Slavin, A. J. // Review of Scientific Instruments;Jun2003, Vol. 74 Issue 6, p3039 

    This article describes a high-stability quartz-crystal microbalance (QCM) and the methodology for measuring the change in mass during thin-film growth in deposition and sputter processes. Much lower noise and higher-frequency stability have been achieved than with conventional QCMs. A stability...

  • Effects of humidity on unencapsulated poly(thiophene) thin-film transistors. Chabinyc, Michael L.; Endicott, Fred; Vogt, Bryan D.; DeLongchamp, Dean M.; Lin, Eric K.; Yiliang Wu; Ping Liu; Ong, Beng S. // Applied Physics Letters;3/13/2006, Vol. 88 Issue 11, p113514 

    The effects of humidity on unencapsulated polymeric thin-film transistors (TFTs) of poly[5,5’-bis(3-dodecyl-2-thienyl)-2,2’-bithiophene] (PQT-12) were investigated. The field effect mobility of PQT-12 TFTs decreases and the rate of trapping of charge carriers increases under...

  • Effects of mass layer dimension on a finite quartz crystal microbalance. Kong, Y.; Liu, J.; He, H.; Yang, J. // Acta Mechanica;Nov2011, Vol. 222 Issue 1/2, p103 

    In this paper, we investigate free thickness-shear and thickness-twist vibrations of a finite crystal resonator of AT-cut quartz carrying a thin mass layer at the central portion of its top surface operating as a quartz crystal microbalance. The equations of anisotropic elasticity are used with...

  • Sensitivity study of multilayer thin-film bulk acoustic resonator for mass sensor application. Haiqiang Liu; Fang Li; Lifeng Qin; Qing-Ming Wang // Journal of Applied Physics;10/21/2016, Vol. 120 Issue 15, p1 

    The sensitivity of multilayer thin-film bulk acoustic resonators (MTFBARs) used as mass sensors is investigated. MTFBAR sensors with the structure of a mass-sensitive layer/electrode layer/piezo layer/electrode layer were used. Two methods, one using electric impedance and the other...

  • In situ investigation of surfactants' effect onto electrochemical synthesis and properties of polyfurans. Nohut, Neslihan; Eren, Esin; Rahhal-Irabi, Layla; Oksuz, Aysegul // Journal of Materials Science;Apr2014, Vol. 49 Issue 7, p2754 

    Polyfuran (PFu) films were electrochemically deposited onto gold electro-quartz crystal microbalance (EQCM) electrodes using acetonitrile (ACN)/LiClO solvent-electrolyte in presence of dodecylbenzenesulfonic acid (anionic, DBSA) and polyethylene glycol sorbitan monolaurate (non-ionic, Tween 20)...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics