Data Credibility Concerns in 'Donor-Acceptor-Type Conjugated Polymers with Balanced Conjugation Degree and Group Rotation for Solar-Thermal Conversion Applications' (DOI: 10.1002/adfm.75470)

Academic fraud report · Geng Detector

Summary

This review examines potential data integrity issues in a 2026 Advanced Functional Materials paper reporting PTT-BTQ conjugated polymers for solar-thermal conversion (DOI: 10.1002/adfm.75470). The verdict is 'questionable,' based on two principal observations rather than direct proof of fabrication. First, Figure 2c reports that PTT-BTQ maintains a peak temperature of approximately 62 °C across 5 to 20 heating-cooling cycles, with curves appearing almost perfectly superimposed; such near-identical reproducibility is inconsistent with the natural variability expected from environmental fluctuations and sensor noise, raising concerns about over-processing or selective presentation. Second, the Seebeck coefficient derived from V = α × ΔT for the same thermoelectric module drifts systematically from 9.79 mV/K (ΔT = 5.7 °C) to 10.39 mV/K (ΔT = 10.2 °C) to 13.39 mV/K (ΔT = 20.8 °C). Because α is a near-constant physical property of a device, this systematic drift suggests post-hoc fitting or an unmodeled thermal loss mechanism. Neither finding is conclusive evidence of fabrication, but both warrant raw-data verification. Limitations: visual analysis only, without access to underlying CSV/raw measurements, thermal imaging frames, or full methods text.

Verdict

🟡 Questionable. The paper presents two notable statistical and physical-consistency anomalies that do not constitute definitive proof of misconduct but strongly suggest over-processed, selectively presented, or post-hoc fitted experimental data. Raw-data disclosure is required to resolve these concerns.

Key findings

Figure 2c (PTT-BTQ photothermal cycling): Reported peak temperature of ~62 °C is claimed to remain stable across 5–20 heating-cooling cycles. The overlaid curves visually appear near-perfectly superimposed in the main figure, an outcome inconsistent with natural experimental variability.
Seebeck coefficient drift (Water-Electricity Cogeneration Device): For the same thermoelectric module, the implied Seebeck coefficient α varies systematically with applied thermal gradient: α₁ = 9.79 mV/K, α₂ = 10.39 mV/K, α₃ = 13.39 mV/K.
Pattern: Both anomalies point toward data smoothing, selective filtering, or post-hoc fitting rather than independently measured raw outputs.

Evidence highlights

Photothermal cycling (Figure 2c, Page 4): Five-cycle (and reportedly 20-cycle) heating-cooling curves are stated to be visually indistinguishable; environmental stochasticity, IR-camera thermal drift, and minor lamp fluctuations normally prevent such reproducibility without processing.
Seebeck calculation (Page 8):
Condition 1: V = 55.8 mV, ΔT = 5.7 °C → α = 9.79 mV/K
Condition 2: V = 106.0 mV, ΔT = 10.2 °C → α = 10.39 mV/K
Condition 3: V = 278.6 mV, ΔT = 20.8 °C → α = 13.39 mV/K

Notes

DOI: 10.1002/adfm.75470 (preserved exactly as provided)
Confidence: Moderate for the statistical anomalies; visual superimposition of cycling curves is suggestive but not definitive, and the Seebeck drift has plausible alternative explanations (e.g., interfacial thermal resistance scaling with ΔT, Peltier-induced non-linearity, or measurement lag at larger gradients).
Limitations: Analysis was conducted on the reported summary numbers and visual description; the full text, raw CSV data, IR thermography frames, and device calibration certificates were not independently inspected.
Recommended actions: (1) Request raw IR-camera exports for the cycling experiments to verify whether smoothing or trace selection occurred; (2) Request time-resolved V–ΔT traces and full device calibration to explain the non-constant Seebeck response; (3) Cross-check any reported reproducibility claims against independent re-measurement.