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<p>The present work demonstrates the role of synthesis mechanism in affecting the interaction behavior of aluminum phthalocyanine hydroxide (AlPcOH) thin films with diethylamine (DEA) vapors. Thin films of AlPcOH on glass substrates have been synthesized through thermal evaporation, drop casting and spin coating using similar content of AlPcOH for all the films. Maximum sensitivity toward DEA has been observed by drop-cast (431&#xa0;ppm<sup>−1</sup>) and minimum by thermally evaporated (96.3&#xa0;ppm<sup>−1</sup>) AlPcOH thin films. Observation of smaller-size grains and ample surface-active sites of drop-cast AlPcOH film for DEA vapors in field emission scanning electron microscopy leads to maximum sensing responses as compared to thermally evaporated and spin-coated films. Surface-interface interaction is strongly governed by surface homogeneity, density of surface atoms and uniformity of thin films that alter charge transfer interactions with surface atoms of AlPcOH thin films. Electrical sensing results have been found to be consistent with optical and spectroscopic sensing results.</p>

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Effect of synthesis mechanism on surface interaction of aluminum phthalocyanine thin films with diethylamine (DEA) vapors

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • R. Ridhi,
  • Sonali Kakkar,
  • G. S. S. Saini,
  • S. K. Tripathi

摘要

The present work demonstrates the role of synthesis mechanism in affecting the interaction behavior of aluminum phthalocyanine hydroxide (AlPcOH) thin films with diethylamine (DEA) vapors. Thin films of AlPcOH on glass substrates have been synthesized through thermal evaporation, drop casting and spin coating using similar content of AlPcOH for all the films. Maximum sensitivity toward DEA has been observed by drop-cast (431 ppm−1) and minimum by thermally evaporated (96.3 ppm−1) AlPcOH thin films. Observation of smaller-size grains and ample surface-active sites of drop-cast AlPcOH film for DEA vapors in field emission scanning electron microscopy leads to maximum sensing responses as compared to thermally evaporated and spin-coated films. Surface-interface interaction is strongly governed by surface homogeneity, density of surface atoms and uniformity of thin films that alter charge transfer interactions with surface atoms of AlPcOH thin films. Electrical sensing results have been found to be consistent with optical and spectroscopic sensing results.