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Electron\u2010beam (EB) shrinking provides precise, real\u2010time feedback and is ideally suited to address these requirements. However, it necessitates an initial pore diameter smaller than the membrane thickness for effective shrinking without material addition. Typical focused ion beam (FIB)\u2010drilled pores in silicon nitride membranes often fail to meet these requirements. Alternative efforts towards mitigating these bottlenecks through deploying hydrocarbon\u2010mediated EB shrinkage face challenges due to uncontrolled carbon contamination or a lack thereof in cleaner transmission electron microscope (TEM) chambers. To address these challenges, here we report an alternative approach of high\u2010precision hydrocarbon\u2010mediated EB shrinking with hydrocarbons sourced externally through controlled surface reactions on exposure to ethanol. This provides several decisive advantages, including the reduction of pore diameters much larger than the membrane thickness and controlled shrinking in cleaner environments without contaminations. These measures accelerate nanopore fabrication, improve its predictability by eliminating the dependence on variable carbon contamination in vacuum chambers, and provide high\u2010resolution live feedback during dimension tuning. As a result, our method supports the large\u2010scale production of nanopores with analyte\u2010specific, tuneable dimensions. This capability is particularly imperative for low\u2010noise biomolecular sequencing applications that leverage electrically\u2010modulated transport and sensing over nanoscales. These features could pave the way for the broader application of SSNPs, addressing long\u2010standing challenges in their fabrication and functionalisation that remained unresolved thus far.<\/jats:p>","DOI":"10.1002\/elps.8150","type":"journal-article","created":{"date-parts":[[2025,5,5]],"date-time":"2025-05-05T05:29:35Z","timestamp":1746422975000},"page":"1308-1315","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Precise Shrinkage of Silicon Nitride Nanopores Via Externally Sourced Hydrocarbons"],"prefix":"10.1002","volume":"46","author":[{"given":"Debmalya","family":"Roy","sequence":"first","affiliation":[{"name":"Indian Institute of Technology Kharagpur  Kharagpur India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aniruddha","family":"Guha","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Kharagpur  Kharagpur 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