📋 Workflow
Full workflow, products add-to-cart directly1
Prepare catalyst
1 hDeposit or impregnate an iron-based catalyst precursor on a substrate or support.
💡 Tip Ammonium salts disperse better
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2
Load furnace & preheat
1 hLoad the tube furnace and ramp under inert gas to reduce the catalyst.
💡 Tip Even ramp prevents catalyst sintering
⚠️ Caution Vent H₂ properly during reduction
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3
Growth with carbon source
30 min–2 hSwitch to the carbon source gas and hold temperature for growth.
💡 Tip Flow rate tunes diameter and density
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4
Cool & collect
1–2 hStop the carbon gas, cool under inert gas, and collect the product.
💡 Tip Cool under inert gas to avoid oxidation
5
Purify & characterize
HoursAcid-wash to remove catalyst, confirm diameter and purity by Raman and TEM.
⚠️ Caution Handle strong acid with care
🧪 Materials for this step (click to shop by spec/brand)
⚠️ 5 Common Beginner Mistakes
- ① Sintered catalyst fails growth
- ② Excess carbon source makes soot
- ③ Low temperature gives partial growth
- ④ Impure gases add defects
- ⑤ Overlong acid wash cuts tubes
❓ FAQ
+How to control diameter?
Smaller catalyst particles give thinner tubes.
+Improve purity?
Reduce growth time and acid-wash catalyst.
+Single- vs multi-wall?
Growth conditions/catalyst control the wall number.