Electrochemical biosensors,
one monolayer at a time.

Summer Undergraduate Research Fellow (SURF #2) · XJTLU · Supervisor: Dr. Qiuchen Dong

• Designed a controlled single-variable experiment comparing mixed SAM (11-MUA + 6-MCH-ol, 1:10 mol ratio, 12 h) vs. single-component MPA SAM (72 h) on Au bulk working electrodes — cleanly isolating the MCH-ol dilution effect from MUA-density confounds.
• Independently performed all wet-lab work, EIS characterization (0.1 Hz–100 kHz, +0.17 V DC, Randles + CPE fitting), and 8-concentration × 3-replicate cortisol calibration (0.1 ng/mL – 100 µg/mL) across 4 independent electrodes.
• Built an end-to-end analysis pipeline (xlsx → Python → visualization → PDF) and transparently reported a worst-case R² = 0.69 alongside the best-case R² = 0.984 — keeping calibration-rule choices auditable.
• Methodology adapted from T. Ji et al., Talanta 280 (2024) 126776.

Summer Undergraduate Research Fellowship (SURF #1) · XJTLU · Supervisor: Dr. Qiuchen Dong · Project No. SURF-2025-0494

• Cultured E. coli K-12 in LB medium; built a semi-quantitative dual-modal cross-validation by simultaneously acquiring EIS (1 Hz–100 kHz, 10 mV, 20 mM K₃[Fe(CN)₆] / 1 M KNO₃) and OD₆₀₀.
• Functionalised Au SPEs (alumina polish → electrochemical cleaning → MPA SAM in 75:25 EtOH:H₂O, overnight) with anti-E. coli antibody via EDC/NHS coupling (4 µg/mL, 2 h) and 1% BSA blocking.
• Operated Autolab PGSTAT302N; extracted charge-transfer resistance R_ct via Randles equivalent-circuit fitting as the primary quantitative metric.
• Screened 6 candidate variables for inter-batch drift and identified the polishing-to-SAM interval as the dominant factor — reducing cross-batch RSD from 30%+ to 12%.

XJTLU Start-up Incubator

• Translating the SURF #1 EIS sensor into a field-deployable E. coli water-quality platform; owning the anti-E. coli antibody immobilisation on gold working electrodes and the wet-lab LOD performance.
• Drove PoC-to-product engineering: pushing lab-scale single-point EIS toward a deployable prototype while balancing electrochemical stability, iteration cadence, and cross-functional resource priorities.
• Represented the team at the 15^th "Challenge Cup" China College Students' Entrepreneurship Plan Competition (provincial round) — led technical Q&A and the roadshow pitch.

Department of Chemistry, XJTLU

• Led a 3-person wet-lab team; designed a shared Google-Sheet booking system with 7 AM priority shifts to resolve Autolab potentiostat contention, raising equipment utilisation from 60% to 90%.
• Diagnosed and resolved a critical RSD rebound (12% → 28%) two days before the mid-term presentation by tracing it to a contaminated EDC/NHS batch and switching back to a known-good lot.
• Owned the full electrode-modification workflow and Randles-circuit EIS analysis; produced a complete dataset and draft manuscript.

Xi'an Jiaotong–Liverpool University (XJTLU) · Suzhou, China

Selected Year 1–2 modules:

Inorganic Applications of Group Theory Intermediate Organic Chemistry The Biology of Microbes Preparative Chem. Synthesis & Charact. Lab. Techniques Intermediate Inorganic Chemistry Further Key Skills in Chemistry Measurements in Chemistry Introductory Spectroscopy Intermediate Physical Chemistry Analytical Chemistry