Analytical Chem JoVE (Open Access) Citable · DOI

Soft Lithographic Functionalization and Patterning Oxide-free Silicon and Germanium

Name: Soft Lithographic Functionalization and Patterning Oxide-free Silicon and Germanium
Uploaded: 2026-06-17
Duration: 12 min 38 s
Description: The development of hybrid electronic devices relies in large part on the integration of (bio)organic materials and inorganic semiconductors through a ...

DOI: 10.3791/3478-v

What you'll learn

✓ Create oxide-free silicon and germanium surfaces with methyl-terminated monolayers
✓ Apply soft lithography techniques to pattern reactive organic monolayers
✓ Functionalize patterned substrates with small molecules and proteins

Protocol

Here we describe a simple method for patterning oxide-free silicon and germanium with reactive organic monolayers and demonstrate functionalization of the patterned substrates with small molecules and proteins. The approach completely protects surfaces from chemical oxidation, provides precise control over feature morphology, and provides ready access to chemically discriminated patterns.

Difficulty

advanced

Total time

~4–6 hours per sample set (including monolayer formation, stamp preparation, and patterning)

Steps

Form primary methyl-terminated monolayer on silicon

Establish a reactive organic monolayer on oxide-free silicon surface using hydridation chemistry. This protects the silicon from oxidation while providing chemical functionality for downstream patterning.

▶ 03:25

Form primary methyl-terminated monolayer on germanium

Apply the same monolayer formation protocol to oxide-free germanium substrates to create protected, reactive surfaces suitable for patterning.

▶ 05:07

Prepare NHS-activated substrate for coupling

Convert the monolayer-coated substrate with N-hydroxysuccinimide (NHS) functionality to enable subsequent protein and small molecule conjugation.

▶ 05:50

Prepare and use acidic polyurethane acrylate stamp

Fabricate and apply a PUA soft lithographic stamp to transfer patterns onto the functionalized substrate with precise morphological control.

▶ 06:26

Generate protein patterns on substrate

Functionalize patterned regions with proteins using the NHS-activated groups, demonstrating selective protein immobilization in defined areas.

▶ 08:13

Perform catalytic nano-patterning and functionalization

Apply catalytic methods to achieve nano-scale pattern generation and concurrent chemical functionalization of the silicon or germanium substrate.

▶ 09:21

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