Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)3D (three dimensional) architectures synthesised using an easily scalable solid state method which results in an interconnected network of porous h-BN sheets with boron trioxide are reported in this study. The boron trioxide acts as a nucleating agent for the formation of laterally large nanosheets of h-BN with a low density and increases the specific surface area. The stable form shows improved mechanical properties (experimentally and using MD simulation) and serves as a suitable material for humidity and liquefied petroleum gas (LPG) sensor applications. The sensor shows stability for up to several months without losing its sensitivity.6918788887896University Grants Commission, New Delhi, Government of IndiaU.S. Air Force Office of Scientific Research [FA9550-14-1-0268, FA9550-12-1-0035]UGC, Govt. of IndiaCenter for Computational Engineering and Sciences at Unicamp through the FAPESP/CEPID [2013/08293-7]Brazilian Federal Agency CAPES via PNPD programFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)