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However, conventional LIG\u2010based humidity sensors employing lateral\u2010contact configurations often exhibit limited responsivity, owing to their partially exposed structures and dominant subsurface current pathways. This study presents a novel vertical\u2010contact architecture that utilizes vertically aligned LIG nanotips for ultra\u2010sensitive humidity detection. Single\u2010pulse laser irradiation induces localized growth of the LIG nanotips, simultaneously forming in\u2010situ vertical contacts with both the top and bottom graphene electrodes. This fully exposed structure provides a highly efficient sensing interface. By adjusting the air\u2010gap height between the electrodes, the sensor operates in two distinct modes: Contact Mode, which achieves high responsivity (40%) via resistance modulation by water adsorption, and Remote Mode, which leverages field ionization to achieve exceptional responsivity (14\u00a0000%). The sensors demonstrate rapid response and recovery times (&lt;1\u00a0s), excellent stability, and high gas selectivity. Integration into wearable face masks enables real\u2010time respiratory monitoring, including hyperventilation and high\u2010frequency breathing (up to 156\u00a0bpm), without signal degradation. This study presents a simple and scalable strategy for fabricating high\u2010performance humidity sensors for next\u2010generation wearable healthcare applications.<\/jats:p>","DOI":"10.1002\/smll.202505017","type":"journal-article","created":{"date-parts":[[2025,7,4]],"date-time":"2025-07-04T04:32:42Z","timestamp":1751603562000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["In\u2010Situ Vertical\u2010Contact Engineering of Laser\u2010Induced Graphene Nanotips for Ultra\u2010Sensitive Humidity Sensors"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-4173-8345","authenticated-orcid":false,"given":"Ki Wan","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Electronics Engineering Chungnam National University  Daejeon 34134 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Won Gyun","family":"Park","sequence":"additional","affiliation":[{"name":"Department of Electronics Engineering Chungnam National University  Daejeon 34134 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Do\u2010Yeon","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Electronics Engineering Chungnam National University  Daejeon 34134 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ga\u2010Won","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Electronics Engineering Chungnam National University  Daejeon 34134 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Binghao","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering Southeast University  Nanjing Jiangsu 211189 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7490-000X","authenticated-orcid":false,"given":"Jae\u2010Hyuk","family":"Ahn","sequence":"additional","affiliation":[{"name":"Department of Electronics Engineering Chungnam National University  Daejeon 34134 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,7,4]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1039\/D1TC04180K"},{"key":"e_1_2_8_2_1","volume":"270","author":"Li Z.","year":"2021","journal-title":"Polymer"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.nanoen.2023.108745"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/adhm.202401532"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/acssensors.7b00199"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.snb.2020.128104"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1109\/JBHI.2016.2573286"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41378-022-00372-4"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202103559"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1542\/peds.2020-1330"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.mser.2024.100804"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10072-016-2790-8"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.4330\/wjc.v7.i4.204"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.snb.2018.06.009"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-017-18979-3"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2021.133751"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.9b05709"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.snb.2016.01.015"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsami.6b02206"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.snb.2021.130371"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-022-30648-2"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1021\/nn404889b"},{"key":"e_1_2_8_23_1","volume":"131","author":"Fei T.","year":"2014","journal-title":"J. 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