MP-SPR for Material Science

Why to choose MP-SPR? choose MP-SPR?

True thickness from Å to µm: The unique wide-angle scanning range ensures compatibility not only with thin layers (from Ångströms) but also thicker layers (up to a few micrometers). Thickness and refractive index (RI) can be determined by fitting of curves using Fresnel formalism. With additional wavelengths, a single solution can be found without prior knowledge of RI or thickness.

782 nm (L1)

654 nm (L2)

0,95 0,15 0,2 0,25 0,3 0,35 0,4 0,45 0,5 0,55 0,6 0,65 0,7 0,75 0,8 0,85 0,9

70.5 70.7471

6,25 FC0 670nm 4,62 FC0 670nm 1,27 FC2 670nm 6,61 FC2 670nm

70

69.5

PEI

PSS

69

Calculated 1 Calculated 2 Calculated 3 Calculated 4

68.5

68

Deg

67.5

AI O Graphene Au Glass

67

Re ected intensity

66.5

66

65.4885

39,4483 40

41

42

43

44

45

46

47

48

49

50

0.230883

25

50

75

100

125

150

187

Angle

Time (min)

Single monolayer of graphene was measured as 3.7Å thick at 670 nm wavelength. Thin layers form a single peak in a MP-SPR scan.

Self-assembly of polyelectrolyte multilayers is measured in real-time at two wavelenghts ( 670 nm and 785 nm ). Twenty layers are formed in-situ . Thickness for each layer can be determined. The true layer thickness is 2.5 nmper bilayer.

Fromnanoparticles to layers andmultilayers: MP-SPR can serve as an at-line validation tool for thin filmdeposition processes such as CVD and ALDmay it be for a single layer or for a stack. As there is no vacuum required, measurements can be done inminutes.

0,9

1

0,8

0.8

0,7

0,6

0.6

0,5

39.4 mm 39.2 mm 39.2 mm

D e p o s i t i o n c h a m b e r

0,4

50.4 mm

49.0 mm

0.4

0,3

0,2

Re ected Intensity

Re ected Intensity (a.u) 0.2 Target

0,1

0

0.0

60

62

64

66

68

70

72

74

76

78

40

41

42

43

44

45

46

Angle (deg)

Angle (degree)

Binding of functionalized gold nanoparticles (50 nm in diameter) onto a self-assembled polymer surface measured with MP-SPR at 785 nm.

Even subnanometer differences in the inner and outer circles within a CVD chamber can be measured using MP-SPR. Here, MP-SPR discovered a 10 nm difference in metal deposition thickness towards center and 0.2 nm difference along the outer circle.

Real-time interactions: MP-SPR is a real-time method and therefore allows for measurements of swelling of materials when moving from dry to wet environment, material-solvent interactions, nanoparticle adsorption kinetics, protein resistance and more.

FC1 670 nm FC2 785 nm FC3 670 nm FC4 785 nm

2

0.45

0V

0.4V

0V

-0.25V 0V

0.4V

0.4

a b c d

Nanocellulose

0.35

0.3

1

0.25

100% humidity

dry

Sensor

0.2

Deg

Deg

0.15

0

0.1

PAA

0.05

PEDOT Sensor

0.4V

-0.25V

0

-0.05

0

20

40

0.151633

100

200

300

391

Time (min)

Time (min)

Real-time swelling of nanocellulose under different water vapour concentrations.

PAA polymer brushes swelling and collapse caused by pH and electric potential change.