Phase and Microphase Separation of Polymer Thin Films Dewetted from Silicon—A Spin–Echo Resolved Grazing Incidence Neutron Scattering Study

Vorobiev, Alexeï; Major, J.; Dosch, H.; Müller‐Buschbaum, Peter; Falus, Péter; Felcher, G. P.; Velthuis, S. G. E. te

doi:10.1021/jp1120756

Cited by 10 publications

(6 citation statements)

References 48 publications

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“…Repeat steps 3.6.1-3.6.3 for any further samples that need to be measured. 7. The collected data consists of both spin up and spin down 2D intensity maps for each sample.…”

Section: Sergis Experimentsmentioning

confidence: 99%

“…Inelastic spin echo techniques were developed by Mezei et al 1 in the 1970s. Since then the SERGIS technique (which is an extension of the ideas of Mezei et al) has been successfully demonstrated experimentally using a variety of samples such as highly regular diffraction gratings [2][3][4][5][6] and circular de-wetted polymer droplets 7 . A dynamical theory has been developed by Pynn and coworkers to model the strong scattering from highly regular samples [3][4][5][6]8 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials

Parnell

Hobson²,

Dalgliesh

et al. 2014

JoVE

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The spin echo resolved grazing incidence scattering (SERGIS) technique has been used to probe the length-scales associated with irregularly shaped crystallites. Neutrons are passed through two well defined regions of magnetic field; one before and one after the sample. The two magnetic field regions have opposite polarity and are tuned such that neutrons travelling through both regions, without being perturbed, will undergo the same number of precessions in opposing directions. In this case the neutron precession in the second arm is said to "echo" the first, and the original polarization of the beam is preserved. If the neutron interacts with a sample and scatters elastically the path through the second arm is not the same as the first and the original polarization is not recovered. Depolarization of the neutron beam is a highly sensitive probe at very small angles (<50 μrad) but still allows a high intensity, divergent beam to be used. The decrease in polarization of the beam reflected from the sample as compared to that from the reference sample can be directly related to structure within the sample. In comparison to scattering observed in neutron reflection measurements the SERGIS signals are often weak and are unlikely to be observed if the in-plane structures within the sample under investigation are dilute, disordered, small in size and polydisperse or the neutron scattering contrast is low. Therefore, good results will most likely be obtained using the SERGIS technique if the sample being measured consist of thin films on a flat substrate and contain scattering features that contains a high density of moderately sized features (30 nm to 5 µm) which scatter neutrons strongly or the features are arranged on a lattice. An advantage of the SERGIS technique is that it can probe structures in the plane of the sample.

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“…Repeat steps 3.6.1-3.6.3 for any further samples that need to be measured. 7. The collected data consists of both spin up and spin down 2D intensity maps for each sample.…”

Section: Sergis Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials

Parnell

Hobson²,

Dalgliesh

et al. 2014

JoVE

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“…Other applications of NR include investigating block copolymer morphologies, (108 -110) the mobility of polymer segments in confined geometries, (111,112) and examining the interface and adhesion of polymers on substrates. (113,114) Instruments to carry out in situ NR on samples undergoing shear flow have been developed. (115) (104) with permission).…”

Section: Neutron Reflectionmentioning

confidence: 99%

Neutron Scattering in the Analysis of PolymersUpdate based on the original article by D. G. Bucknall,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

Roland

2012

Encyclopedia of Analytical Chemistry

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The focus of this article is the application of neutron scattering in polymer science, with various examples given to illustrate the types of problems addressed. Neutron scattering is a powerful analytical tool for investigating polymers. Unique aspects such as the capacity to measure thick samples with an absence heating or radiation-induced damage, selective control of the scattering contrast by isotopic substitution, and the measurement of dynamic properties as a function of length scale are among the many attributes that make neutron methods not just complementary to other analytical techniques, but in many cases the only means to address material issues. The information that can be obtained from neutron scatteringthe size, form, and orientation of molecular chains, Update based on the original article by D. G. Bucknall, Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.the thermodynamics and phase structure of mixtures, interfaces and interfacial phenomena, the dynamics at both the local and global length scales, details of the structure of complex nanocomposites and biological materials, etc.has only been surveyed herein. It is a testament to the utility of neutron scattering that even though the application of neutrons to polymers did not begin in earnest until the 1990s, through the past decade, about 325 peer-reviewed publications per year have appeared on the topic. Whether this figure changes in the future will likely depend on the availability of the specialized, costly facilities required for neutron experiments. Certainly there is no expectation of abatement in the number of important problems in polymer science that can be addressed using neutron methods.

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“…As a result, large sample areas are required and the instrument performs more like a reflectometer. An attempt to make effective use of divergent neutron beams is the use of spin polarised neutrons together with magnetic fields for Lamor precession to encode the scattering angle with so-called spin-echo-resolved grazing incidence scattering (SERGIS) 11 – 13 . Instead of spatial angular resolution this method measures the depolarization of the beam to record very week scattering of neutrons in the sample plane.…”

Section: Introductionmentioning

confidence: 99%

Π-GISANS: probing lateral structures with a fan shaped beam

Vorobiev

Paracini

Cárdenas

et al. 2021

Sci Rep

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We have performed grazing incidence neutron small angle scattering using a fan shaped incident beam focused along one dimension. This allows significantly reduced counting times for measurements of lateral correlations parallel to an interface or in a thin film where limited depth resolution is required. We resolve the structure factor of iron inclusions in aluminium oxide and show that the ordering of silica particles deposited on a silicon substrate depends on their size. We report hexagonal packing for 50 nm but not for 200 nm silica spheres deposited by a modified Langmuir-Schaefer method on a silicon substrate. For the 200 nm particles we extract the particles shape from the form factor. Moreover, we report dense packing of the particles spread on a free water surface. We name this method π-GISANS to highlight that it differs from GISANS as it gives lateral information while averaging the in-depth structure.

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Phase and Microphase Separation of Polymer Thin Films Dewetted from Silicon—A Spin–Echo Resolved Grazing Incidence Neutron Scattering Study

Cited by 10 publications

References 48 publications

Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials

Using Neutron Spin Echo Resolved Grazing Incidence Scattering to Investigate Organic Solar Cell Materials

Neutron Scattering in the Analysis of PolymersUpdate based on the original article by D. G. Bucknall,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

Π-GISANS: probing lateral structures with a fan shaped beam

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