Muhammad Erik Ferdian

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Questions related from Muhammad Erik Ferdian

Unexpected Emission Colors in Red and Yellow CQDs Synthesis — Any Advice?

Dear researchers, I am currently working on the synthesis of carbon quantum dots (CQDs) following the procedure reported in Synthesis of multi-color fluorescent carbon quantum dots and......

last month 3,519 6 View

Unexpected Increase in Urea Concentration After Adsorption Using Biochar – Any Insights?

Dear researchers, I am conducting an adsorption study of urea using biochar derived from rice husk. I varied the contact time to investigate the adsorption kinetics. After the adsorption process,...

27 May 2025 8,834 2 View

How to Prepare ZnS Nanomaterials for PL Quantum Yield Measurement?

I’ve synthesized ZnS nanomaterials for phosphorescence studies and am now trying to measure their photoluminescence (PL) quantum yield using a spectrofluorometer. However, I’m struggling to...

15 May 2025 4,346 2 View

Can urea be accurately measured at 278.5 nm (UV-Vis) without complexation? Is this method applicable for fertilizer samples? Any considerations?

I am currently conducting research on slow-release urea fertilizers and need to determine the urea content in my samples. Based on my literature review, most methods for urea determination involve...

14 March 2025 9,519 1 View

We are extracting gold using borax smelting, but it forms granules instead of fusing. What causes this, and how can we achieve proper fusion?

We are extracting gold from ore on a small scale using a borax smelting method. However, instead of forming a single fused mass, the recovered gold appears as dispersed granules. What could be the...

11 March 2025 2,602 1 View

Issue in CQDs Synthesis via Microwave Irradiation

I synthesized Carbon Quantum Dots (CQDs) using microwave irradiation (700 W, 1 h) with citric acid as the precursor. The resulting material formed a brownish residue at the bottom of the container...

01 January 1970 9,200 0 View