main.tex

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\documentclass[12pt, oneside]{book}

\usepackage[a4paper,lmargin=35mm,rmargin=25mm,tmargin=25mm,bmargin=25mm]{geometry}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{amsmath}
\usepackage[hidelinks]{hyperref}
\usepackage{footnote}
\usepackage{fancyhdr}
\usepackage[explicit]{titlesec}
\usepackage{cite}
\usepackage{tabularx}
\usepackage[dvipsnames]{xcolor}
\usepackage{sectsty}
\usepackage{subfiles}
\usepackage{lscape}
\usepackage{array}
\usepackage{placeins}
\usepackage{mfirstuc}
\usepackage[utf8]{inputenc}
\usepackage{lastpage}
\usepackage[english]{babel}
\usepackage[justification=centering]{caption}
\usepackage{notoccite}

\addto\captionsenglish{\renewcommand{\chaptername}{CHAPTER}}

\renewcommand{\headrulewidth}{0pt}

\chaptertitlefont{\large \color{black} \centering \uppercase}
\chapternumberfont{\vspace{-2cm} \large \color{black} \centering}
\sectionfont{\normalsize \color{black}}

\newcolumntype{b}{>{\hsize=.8\hsize \centering\arraybackslash}X}
\newcolumntype{s}{>{\hsize=.4\hsize \centering\arraybackslash}X}
\newcolumntype{m}{>{\hsize=.5\hsize \centering\arraybackslash}X}

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\begin{document}

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%\shipout\null 
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\subfile{title_pages.tex}
\subfile{declaration.tex}
\subfile{approval.tex}
\subfile{dedication.tex}
\subfile{acknowledgements.tex}
\subfile{abstract.tex}

\tableofcontents
\listoffigures

\subfile{Introduction.tex}
\subfile{literature_review.tex}
%\subfile{Experimental.tex}
%\subfile{results_xrd.tex}
%\subfile{results_dsc.tex}
%\subfile{results_sem.tex}
%\subfile{results_tem.tex}
%\subfile{results_xps.tex}
%\subfile{results_uv.tex}
%\subfile{results_magnetic.tex}
\subfile{conclusions.tex}
\subfile{futurework.tex}

\bibliographystyle{unsrt}
\bibliography{introduction}

\end{document}