Metal-organic framework (MOF) characterization
using MP-SPR

Application Note #153

Figure 2. Real-time monitoring of metal-organic framework assembly. Altering layers of tannic acid (TA) and Iron (III) were deposited. Deposition was measured simultaneously using two different wavelengths (670 nm and 785 nm). As expected, using 670 nm wavelength results in larger shift in SPR curve compared to 785nm wavelength. Stronger binding of Iron (III) can be detected after the third Fe(III) injection (at time point 127 min).

Metal-polyphenol complex (MPC) film deposition was monitored in situ using Multi-Parametric Surface Plasmon Resonance (MP-SPR). The sequential deposition of Tannic Acid (TA) and Fe(III) ions was performed up till 8 cycles. Depositions were measured at two wavelengths (670 nm and 785 nm), and thickness and refractive index were determined using LayerSolver™ software. The first three layers were initial layers, forming only about 2 nm MOF layer on the surface. Thickness of all the 8 MOF layers was 21.0 nm and the refractive index was 1.435 (at 670 nm). Fe(III) and TA formed an amorphous MOF layer.

Recommended instrument for this application:

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Further reading

  • If you are interested in reading more, see AN#112 on how MP-SPR was utilized to measure Cu3BTC2(H2O)n MOF in air and in ethanol. Furthermore, you can read how AN#142 on simultaneous electrochemical (EC) and MP-SPR measurements are performed.

  • Do you want to find out how to calculate thickness out of MP-SPR measurements? Click here.

  • Do you want to see how MP-SPR instruments work? Click here.

  • Do you want to see MP-SPR instruments comparison? Click here.

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