You can write it, or at least revise it, after you have written the rest of the paper: this will make the Introduction not only easier to write but also more compelling.
A research paper is a piece of academic writing based on its author’s original research on a particular topic, and the analysis and interpretation of the research findings.
To achieve supreme excellence or perfection in anything you do, you need more than just the knowledge.
Like the Olympic athlete aiming for the gold medal, you must have a positive attitude and the belief that you have the ability to achieve it.
If, for example, your research was about finding the right proportions of two metals in an alloy and you tested ten different proportions, you do not have to list all the ten proportions: it is enough to say that the proportions varied from to .
Compared to two other sections of a typical research paper, namely Methods and Results, Introduction and Discussion are more difficult to write.
If you want others to cite your paper, you should make sure they read it first.
Let us assume that the title and the abstract of your paper have convinced your peers that they should see your paper.
Once the first sentence has introduced the broad field, the next sentence can point to the specific area within that broad field.
As you may have noticed, the papers in the examples mentioned above introduced the subfield by mentioning 1) remission of some types cancer following accidental infection by Streptococcus pyogenes, 2) organic matter in soil as a source of nutrients for plants and of energy for microorganisms, and 3) imaging techniques to visualize the 3-dimensional structure of the materials and components of batteries on nanoscale.