EFFECT OF AMBIENT RELATIVE HUMIDITY AND SOAKING TIME ON THE FORMATION OF OCTADECYLTRICHLOROSILANE COATINGS ON BOROSILICATE GLASS SUBSTRATES FOR ALKALI-METAL VAPOR CELLS

Haotian Chi, Junying Zhang, Heng Yuan, Zhongyu Cai, Sheng Zou and Wei Quan
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Haotian Chi: School of Instrumentation and Optoelectronic Engineering, Beihang University, Shen Yuan Honors College, Beihang University, Beijing 100191, P. R. China
Junying Zhang: School of Physics, Beihang University, Beijing 100191, P. R. China
Heng Yuan: Innovative Research Institute of Frontier Science and Technology, Beihang University, Beijing 100191, P. R. China
Zhongyu Cai: Innovative Research Institute of Frontier Science and Technology, Beihang University, Beijing 100191, P. R. China
Sheng Zou: Innovative Research Institute of Frontier Science and Technology, Beihang University, Beijing 100191, P. R. China
Wei Quan: Advanced Innovation Center for Biomedical Engineering, Beihang University, Innovative Research Institute of Frontier Science and Technology, Beihang University, Beijing Academy of Quantum Information Sciences, Beijing 100191, P. R. China

Surface Review and Letters (SRL), 2021, vol. 28, issue 12, 1-8

Abstract: The most sensitive spin-exchange relaxation-free (SERF) magnetometer generally requires a working temperature greater than 100∘C. To date, octadecyltrichlorosilane (OTS) coating is one of the best candidates for this temperature range. However, the performance and consistency of the OTS coatings within the alkali-metal vapor cells are still poor. In this paper, the formation of OTS coatings on borosilicate glass (BG) substrates was investigated. The effects of ambient relative humidity (RH) on the formation of OTS coatings were examined by atomic force microscopy (AFM) and contact angle measurement. The results showed that 75% RH can improve the order of the OTS coatings and reduce the root mean square (RMS) roughness of the OTS coatings. Under three different ambient RHs, the soaking time of OTS molecules should be greater than 60min to form complete OTS coating.

Keywords: Ambient humidity; soaking time; anti-relaxation OTS coatings; borosilicate glass substrate; alkali-metal vapor cells; SERF magnetometer (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X21501213

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